Relationship of plasma nonesterified fatty acids and walking activity in postpartum dairy cows.

To survive and produce milk, postpartum dairy cows use their reserves through lipolysis. If the negative energy balance is severe, nonesterified fatty acids (NEFA) are formed that can impair several physiological processes. A pilot study suggested that increased walking activity after calving may be related to a reduced serum concentration of NEFA. The objective of this study was to determine the relationship between plasma concentrations of NEFA and walking activity in dairy cattle during the postpartum period. Data were collected from 33 multiparous Holstein-Friesian dairy cows. Walking activities were quantified using pedometry, and blood samples were collected for determination of NEFA. Results of this study indicated that a negative relationship existed between walking activity and plasma NEFA concentrations in postpartum dairy cows.

Non esterified fatty acids (NEFA) in dairy cattle. A review.

The objective of this report is to review the literature on elevated blood concentrations of nonesterified fatty acids (NEFA) before and after parturition in high-yielding dairy cows. It highlights the factors that influence serum NEFA production and their circulation before and after parturition, such as adaptation for nutrient partitioning for fetal needs, onset of lactogenesis, stress of calving and numerous changes in physiological, metabolic, and endocrine status to accommodate parturition and lactogenesis. The role of NEFA in the liver and peripheral tissues and its toxic effects when in excess are discussed. The cow's adaptive physiologic mechanisms to prevent or decrease excessive values of serum NEFA and preventive and therapeutic interventions to enhance these mechanisms are categorized as natural and artificial antidotes respectively. Feeding systems during the dry period and daily exercise or walking activity which may burn excessive NEFA through beta-oxidation in the muscles are considered as more useful antidotes to managing the NEFA metabolism. This will minimize accumulation of lipids in the liver during early lactation and alleviate the negative effects of plasma NEFA leading to more optimal metabolic health and productivity of dairy cows.

Acute phase reactants, challenge in the near future of animal production and veterinary medicine.

The future of acute phase proteins (APPs) in science is discussed in this paper. Many functions and associated pathological processes of APPs are unknown. Extrahepatic formation in local tissues needs attention. Local serum amyloid A (SAA) formation may be involved in deposition of AA-amyloid induced by conformational change of SAA resulting in amyloid formation, having tremendous food safety implications. Amyloidogenesis is enhanced in mouse fed beta pleated sheet-rich proteins. The local amyloid in joints of chicken and mammary corpora amylacea is discussed. Differences in glycosylation of glycoproteins among the APPs, as has been shown for alpha1-acid glycoprotein, have to be considered. More knowledge on the reactivity patterns may lead to implication of APPs in the diagnostics and staging of a disease. Calculation of an index from values of several acute phase variables increases the power of APPs in monitoring unhealthy individuals in animal populations. Vaccinations, just as infections in eliciting acute phase response seem to limit the profitability of vaccines because acute phase reactions are contra-productive in view of muscle anabolism. Interest is focused on amino acid patterns and vitamins in view of dietary nutrition effect on sick and convalescing animals. When inexpensive methodology such as liquid phase methods (nephelometry, turbidimetry) or protein array technology for rapid APP measurement is available, APPs have a future in routine diagnostics. Specific groups of patients may be screened or populations monitored by using APP.

The influence of sociodemographic factors on awareness, knowledge and attitude toward andropause among health professionals in Ile-Ife, Nigeria.

A descriptive study of the awareness, knowledge and attitude of health professionals toward andropause was conducted in Ile-Ife, Nigeria with the aim of assessing the influence of sociodemographic variables of the respondents on their perspectives of the subject matter. The study employed a structured questionnaire to assess respondents' level of awareness and knowledge, and Likert-type scales to rate respondents' attitudes. A total of 187 (45%) respondents indicated previous awareness of andropause, with younger people (aged below 40 years) displaying better awareness compared with the older ones (p = 0.05), and more doctors than 'other technical health professionals' displaying better awareness when compared with health administrators (p < 0.001). However, only 93 (23%) respondents demonstrated a good knowledge of andropause, with more females compared with males recording good knowledge scores (p = 0.01). While a slightly higher proportion of older respondents (aged 40 years and above) compared with younger ones demonstrated good knowledge of andropause, age and marital status were not significantly related to knowledge of the subject matter. While only 23 (5.4%) respondents displayed a positive attitude toward andropause, and respondents' knowledge was found to positively influence their attitude toward it, none of the sociodemographic variables of age, sex or marital status was significantly related to respondents' attitudes. The study concluded that there is still a low level of awareness and knowledge of andropause among health workers in Nigeria, unlike what obtains in more developed countries of the world, and called for active education of both health professionals and the general public on the subject matter of andropause and other related male reproductive health concerns in the country.

Assessment of andropause awareness and erectile dysfunction among married men in Ile-Ife, Nigeria.

Andropause (also known as androgen decline in aging males) has implications for the reproductive health and quality of life of older males. Very few studies have, however, been reported among the Nigerian population on andropause-related issues. This study assesses the perspective and level of awareness of married men in Ile-Ife, South-west Nigeria, of andropause. We also assessed their experience of erectile dysfunction, using a questionnaire based on the review of the International Index of Erectile Dysfunction. The study involved 355 married men, aged between 30 and 70 years. Our result shows a high level of misconception about andropause among our respondents, with 38.9% indicating that it is a myth, and another 23.6% attributing it to various causes other than being a natural aging process. We recorded a prevalence of erectile dysfunction of 43.8% (8.0% severe dysfunction and 35.8% moderate dysfunction). The prevalence of erectile dysfunction increased significantly with age, varying from 38.5% for age 31-40 years to 63.9% for the older age group of 61-70 years. The trend in prevalence of erectile dysfunction with age was significant (p < 0.05). An odds ratio of 2.82 (95% confidence interval 1.19-6.76) was recorded for the prevalence of erectile dysfunction at age 61-70 years compared with age 31-40 years. Our findings indicate a need for health education about andropause in Nigeria, and increased attention to the reproductive health concerns of males, and the older population.

Who's at risk? Men's STD experience and condom use in southwest Nigeria.

Many STD/HIV-prevention programs worldwide assume that individuals' risk of acquiring sexually transmitted diseases, including HIV infection, is highest in the context of commercial sex. To address this assumption, research conducted in urban Southwest Nigeria combined qualitative and quantitative methods to examine men's sexual behavior, condom use, and STD experience in different types of sexual relationships (marital, casual, and commercial). Logistic regression analysis of survey data indicates that number of sexual partners and sex with sex workers are positively and significantly related to STD experience. Follow-up in-depth interviews with clients of sex workers indicate, however, that these men are actually more likely to report having contracted an STD from a casual sex partner than from a sex worker. Men are most uncertain about their vulnerability to STDs with casual partners. Men's condom use is highest in commercial sex, inconsistent in casual relationships, and lowest in marriage. STD/HIV-prevention programs need to address the range of sexual relationships and the meanings and behaviors associated with them.

Analysis of contraceptive discontinuation in six developing countries from durations of use at survey.

We conduct a cross-national study of contraceptive discontinuation among currently married nonsterilized contracepting women in Bolivia, Egypt, Kenya, Sri Lanka, Thailand, and Zimbabwe using the Demographic and Health Surveys (DHS). Since the DHS contains no true completed epochs of contraceptive use, the distribution of use times at survey is used to approximate the distribution of the completed epochs using the renewal theorem. Two techniques based on this approximation are used. The first technique uses local linear regression smoothing of a histogram estimate of the use time at survey pdf which is converted into an estimate of the discontinuation probability function. The second technique poses a proportional hazards Weibull distribution for the discontinuation probability function which is then converted into a model for the use times at survey. This second technique is used to model the observed variations in use across countries while controlling for other sociodemographic factors such as children ever born, age, and education, as well as a variable which encodes knowledge of the fertility cycle. Pill discontinuation probabilities range from 0.12 to 0.47 in the first year. IUD discontinuation probabilities range from 0.18 to 0.53 in the first year. Discontinuation probabilities in Egypt over all methods are in agreement with those reported in Ali and Cleland (1995). Logged relative risks of pill discontinuation range from -0.94 (Sri Lanka) to 0 (Kenya), while logged relative risks of IUD discontinuation range from -0.53 (Sri Lanka) to 0.41 (Zimbabwe). The ordering of risks of pill discontinuation among the six countries considered is in agreement with the ordering of total fertility rates excerpted from Westoff (1991).

Urban nuptiality patterns and marital fertility in Nigeria.

This study indicates that urban marital patterns in nine Nigerian cities influence fertility. Fertility is also influenced by age at marriage, region of residence, ethnicity and religion; education and employment lead to marriage delay and tend to conflict with childbearing by enhancing the status of women.

PIP: Multivariate analysis is performed to determine significant determinants of marital fertility in 9 cities in Nigeria (Jos, Kano, Zaria; Abeokuta, Akure, Ibadan; and Enugu, Owerri, Port Harcourt). Sample populations represented different socioeconomic populations in each city: elite, migrant, mixed, and indigenous. The sample included 10,444 ever married women aged 15-49 years; the survey was conducted by the Department of Demography and Social Statistics at Abafemi Awolowo University of Ile-Ife. The results indicated that female age at first marriage in 1987-88 was 20.4. The Nigerian Fertility Survey had identified cities in the west as having late marriage (22.2 years), cities in the east with a middle position (21 years), and cities in the north early (18 years). The geographic regions correspond to the following ethnic groups: the Hausa Fulani in the North, the Yoruba in the West, and the Igbo in the East. The marriage age declined when adjusted through multiple classification analysis. Christians in the east and west tend to marry later than the Muslim north. Early marriage follows the same pattern as late marriage with the north having the earlier marriage. Educational status affects marriage delay only at the secondary school level. When women worked before marriage, the marriage age was later, particularly those in the formal sector. The same pattern follows for husband's and father's occupation. There is only slight variation by marriage type: polygynous vs. monogamous. There is increasing premarital sexual activity before marriage. Early marriage is also associated with marital disruption. In the bivariate analysis of the relationship between fertility and socioeconomic factors, the mean number of children ever born was 3.4. The west had the lowest number, followed by the east, and then the north. Religion was generally unrelated to children ever born. Children ever born was negatively related to marriage age. Level of education and premarital fertility were inversely related to fertility. Type of marriage was unrelated to fertility. In the multivariate analysis, fertility increased with age at first marriage and the tempo decreased with age.

Marital fertility in polygynous unions in Nigeria.

PIP: The effect of polygyny on fertility, by age cohort, was examined in 4 regions of Nigeria through use of data from the 1981-82 Nigerian Fertility Survey. Simple tabulation of numbers of live births by maternal age and type of marriage union indicated that, with the exception of the 30-39-year age group, fertility in polygynous unions tends to be higher than that in monogamous marriages. Overall, such tabulations reveal an average of 3.90 births among polygynous women and 3.47 births among monogamous women. However, when age-specific fertility rates were compared, except for women under 20 and over 40 years of age, rates were higher in monogamous unions (7.286 overall) than for women in polygynous households (7.200 overall). Mean completed fertility, taking into account marriage duration as well, shows a tendency for women in polygynous unions to be more fertile (with the exception of women aged 25-44 years who had been married 10-19 years). The absolute difference in fertility between the 2 types of marital unions ranged from 0.32 children in the northwest to 0.64 in the southeast. With adjustment for independent variables such as education, the absolute mean differences were reduced, from between 0.28 children in the southeast to 0.42 in the northeast, but the direction of high fertility was still in favor of women in polygynous unions. But when the covariates (e.g., age at marriage) were taken into account as well as the independent variables, there was a dramatic reduction in the mean difference between the fertility of these 2 groups of women. These findings suggest that some changes in reproductive behavior are taking place in Nigeria that are restricting the fertility of women in polygynous unions. These changes are hypothesized to reflect the spread of formal education in Nigeria, with the expectation that women will contribute to the costs involved in educating their children.^ieng

Intergenerational change in family size among the urban residents in Ibadan, Nigeria.

PIP: The relationship between the sizes of family of origin and family of procreation is analyzed using data for 845 households in Ibadan, Nigeria. The results indicate that the relationship is positive but not significant. This weak relationship is attributed to the fact that the population surveyed is one of high social aspirations and of first-generation urban status, for whom size of family of origin is of little significance. (SUMMARY IN FRE AND ITA)^ieng

Breast feeding, birth interval and polygyny in Nigeria.

Polygyny has routinely been claimed to facilitate rules and taboos relating to postpartum sexual abstinence. However, in Nigeria polygyny cannot wholly explain length of postpartum taboo following child birth on the ground that competition among cowives to out do one another in child-bearing results in a tendency of higher fertility and hence shorter postpartum taboo in polygynous households than that in monogamous families. Economic factors have been adduced as reasons explaining the recent tendency for mothers in polygynous families to have longer postpartum abstinence than their counterparts in monogamous households. Specifically, for young mothers aged 15-34, bearing children in quick succession is no longer attractive as in essentially traditional cultures where husband's commitment to caring for children is taken for granted. Hence, the tendency for women in polygynous households to adhere more strictly to rules and taboos relating to postpartum abstinence could be associated to the changing roles of women as they affect their responsibility with respect to the maintenance and training of their children rather than to the institution of polygyny per se.

Interrelations between duration of residence and fertility in a Nigerian primate city.

PIP: Data were taken from a 1974-75 survey of female employment and the small family ideal in Surulere, Ebute-Metta and Yaba in Lagos, Nigeria, to critically examine the duration of residence as a correlate of fertility behavior. It was taken into account that migrants and nonmigrants may have other attributes that may affect their fertility levels other than migrant status. Thus, education and age were controlled for in the cross tabulation of duration of residence with fertility of mothers with different migrant statuses. In a multivariate analysis, in addition to education and age, factors also controlled for were husband's education and income, age at 1st marriage, migration, and employment status. The data had been collected via a probability random sampling of women currently married in the 15-49 age group. The total sample for this study was 1801 respondents; only mothers with at least 1 child were included. The comparison for nonmigrants by varying duration of residence in Lagos was not possible, but for migrants from both Western and Eastern states fertility of recent migrants was considerably lower than that of migrants with longer length of residence in Lagos as well as for that of nonmigrants and 2nd or more generation migrants. The expected high fertility of recent migrants, which should decline gradually as the duration of residence increases according to the principle of assimilation process, was found. In fact, the fertility of migrants from both the Western and Eastern states whose duration of residence had been 25 or more years was the highest. The fertility of the 2nd or more generation migrants assumed that of the native born. The examination of correlates of fertility through the ordinary least square regression showed that the inverse relationship of education of fertility becomes operational only with secondary education or more. The pattern was the same when husband's education was examined. The assumption that fertility increases as one moves further away from the primate city located along the coast was confirmed. Women in employee status had lower fertility than women who were self-employed, but full-time housewives also had lower fertility than those who were self-employed. In contrast to the findings in more developed economies in which education correlates with income and this in turn correlates inversely with fertility, the findings confirmed that income was positively related to fertility. The implication of the findings is that migrants, in terms of reproductive behavior, still retain ties with their places of origin irrespective of the duration of residence in their place of destination.^ieng

Selection of population data base from the votes cast in the 1979 federal elections.

PIP: The authors attempt to provide an estimate of the population of Nigeria from the number of votes cast in the 1979 elections. The discrepancies between the number of votes cast and the number of registered voters are considered. The results of this procedure yield an estimated population of between 66 and 69 million. Comparisons are made with estimates from other sources.^ieng

The problem of population enumeration in Nigeria: further evidence from the 1978 voters' list.

PIP: A history of the political and ethnic problems arising in recent Nigerian attempts to carry out a general population census is first outlined. The author then describes the procedures followed to develop a voters' registration list in preparation for the 1979 census and shows how the same problems arose. He examines the figures included in the voters' list, attempts to assess their accuracy, and considers their usefulness in estimating the population of the country. Alternative estimates of the population of Nigeria ranging from 94 to 103 million are presented, and consideration is given to how accurate these estimates might be. Their implications for Nigeria's socioeconomic development plans are also discussed.^ieng