Effect of Weather Conditions on the Fatty Acid Composition of Medium-Growth Chicken Reared in Organic Production System

A total of 160 medium-sized one-day-old male chicks reared in organic conditions were studied individually from the first day of their life until slaughter (120 days). Two weather periods were considered, being period C colder than period H. A total of 24 chickens per period were randomly selected, then the breast muscle (m. Pectoralis major) was extracted for analysis. Individual fatty acids were measured by gas chromatography and expressed in grams per 100 g of fat. From the values obtained, total lipid fractions were calculated. Near infrared spectroscopy spectra (NIRS) were recorded on the surface of the breast without manipulating. Breast from chicken reared in H period had significantly lower (p<0.05) saturated fatty acids / polyunsaturated fatty acids (SFA / PUFA) ratio, and increased (p<0.05) content in PUFA and n-6. However, no significant differences were observed on the content of individual fatty acid. NIR system was not able to correctly classify the samples according to the breeding period.(AU)

Effect of Weather Conditions on the Fatty Acid Composition of Medium-Growth Chicken Reared in Organic Production System

A total of 160 medium-sized one-day-old male chicks reared in organic conditions were studied individually from the first day of their life until slaughter (120 days). Two weather periods were considered, being period C colder than period H. A total of 24 chickens per period were randomly selected, then the breast muscle (m. Pectoralis major) was extracted for analysis. Individual fatty acids were measured by gas chromatography and expressed in grams per 100 g of fat. From the values obtained, total lipid fractions were calculated. Near infrared spectroscopy spectra (NIRS) were recorded on the surface of the breast without manipulating. Breast from chicken reared in H period had significantly lower (p<0.05) saturated fatty acids / polyunsaturated fatty acids (SFA / PUFA) ratio, and increased (p<0.05) content in PUFA and n-6. However, no significant differences were observed on the content of individual fatty acid. NIR system was not able to correctly classify the samples according to the breeding period.

Plasma PGFM and progesterone concentrations, luteolysis moment and estrous cycle length in Nelore cows submitted to uterine biopsies / Concentrações plasmáticas de PGFM e progesterona, luteólise e comprimento do ciclo estral em vacas Nelore submetidas à coleta de fragmentos endometriais

In this study, endometrial samples were collected in 14 Nelore cows on days zero (ovulation), five, nine, thirteen and nineteen of the estrous cycle (biopsy group), and in 15 females these collections weren't performed (control group). Biopsies were done on the uterine horn endometrium contralateral to the ovary with corpus luteum. Blood samples were taken at -24, -16, -8, 0 +8, +16 and +24 hours in relation to progesterone drop (<1ng/mL, zero moment) and evaluated for 13, 14-dihydro-15-keto prostaglandin F2-alpha (PGFM) by radioimmunoassay (RIA). Plasma progesterone concentration was determined by RIA every 24 hours. Data were analyzed by ANOVA using the PROC GLM and MIXED of the SAS. The mean value for PGFM during the entire period evaluated was greater in the biopsy group. The mean concentration of PGFM at moment zero was not different between the groups; the mean concentration of PGFM was higher in the biopsy group before and after the drop in progesterone level. The maximum mean concentration observed was not different between the groups; however, the mean minimum concentration was different with high values in the biopsy group. Although the PGFM concentrations were higher in the biopsy group, the biopsy and control groups had similar length of estrous cycle showing that repeated endometrial biopsy on the side contralateral to the ovary with corpus luteum does not affect luteolysis and the length of the estrous cycle.(AU)

No presente estudo, foram coletadas amostras endometriais de 14 vacas Nelore nos dias zero (dia da ovulação), cinco, nove, 13 e 19 do ciclo estral (grupo controle), e em 15 fêmeas essas coletas não foram realizadas (grupo controle). As biópsias foram realizadas no corno uterino contralateral ao ovário contendo o corpo lúteo. Amostras plasmáticas foram coletadas nos momentos -24, -16, -8, 0 +8, +16 e +24 horas em relação à queda de progesterona (<1ng/mL, momento zero) e avaliadas quanto à concentração de 13, 14-di-hidro-15-ceto prostaglandina F2-alpha (PGFM) por radioimunoensaio (RIA). As concentrações plasmáticas de progesterona foram avaliadas a cada 24 horas também por RIA. Os dados foram analisados por ANOVA empregando-se PROC GLM e MIXED do SAS. O valor médio de PGFM durante todo o período avaliado foi maior no grupo biópsia. A concentração média de PGFM no momento zero não diferiu entre os grupos, e foi maior no grupo biópsia antes e após a queda de progesterona. A concentração máxima observada não foi diferente entre os grupos, porém a concentração mínima diferiu com maiores valores observados no grupo biópsia. Embora as concentrações de PGFM fossem maior no grupo biópsia, ambos os grupos apresentaram o mesmo comprimento do ciclo estral, demonstrando que a coleta repetitiva de biópsias endometriais no corno uterino contraletral ao ovário contendo o corpo lúteo não afeta a luteólise e o comprimento do ciclo estral.(AU)

Imunoistoquímica de útero e cérvice de cadelas com diagnóstico de piometra / Immunohistochemical of the cervix and uterus of bitches diagnosed with pyometra

Analisou-se a piometra de 31 cadelas, de raças e idades variadas, sendo 25 cadelas com piometra de cérvice aberta e seis de cérvice fechada. Após ovariossalpingo-histerectomia, foram coletados fragmentos da cérvice e do útero para a avaliação imunoistoquímica. Foram analisados os receptores de estrógenos α e β, progesterona e colágenos I e III. Foram realizadas imunomarcações em diferentes regiões da cérvice, como o epitélio glandular, o epitélio luminal e o estroma glandular, assim como em diferentes regiões do útero, como o epitélio glandular e o estroma glandular. As imunomarcações de colágenos I e III foram realizadas nas regiões glandular e muscular da cérvice e do útero. Concentrações de receptores de progesterona foram maiores em cadelas com piometra fechada.(AU)

The pyometra in 31 bitches of different breeds and ages, 25 with pyometra cervix open and 6 closed cervix was analyzed. After the ovariohysterectomy procedure, samples were collected from the cervix and uterus to evaluate immunohistochemistry. For immunohistochemical evaluation estrogen receptors α and β, progesterone and collagen I and III were analyzed. Immunostainings were performed in different regions of the cervix such as glandular epithelium, luminal epithelium and glandular stroma, as well as in different regions of the uterus, such as glandular epithelium and glandular stroma. The immunostainings for collagen I and III were performed in muscular and glandular regions of the cervix and uterus. The concentration the progesterone receptors were elevated in bitches from the closed pyometra.(AU)

Detecção imunoistoquímica de receptores de estrógeno e progesterona no endométrio de vacas Nelore (Bos taurus indicus) durante o anestro pós-parto / Immunohistochemical detection of receptors for estrogen and progesterone in endometrial glands and stroma during the pospartum anestrus in Nelore (Bos taurus indicus) cows

Foram utilizadas 24 vacas Nelore P.O., em anestro pós-parto, diagnosticado pelo histórico reprodutivo, por avaliações ultrassonográficas transretais e por dosagem de progesterona plasmática, que foram submetidas à colheita de fragmento uterino via transcervical. Os animais foram divididos em dois grupos conforme o máximo diâmetro folicular: grupo 1: folículos <6mm (n=12); grupo 2: folículos >6mm (n=12). Para avaliar receptor de estrógeno e receptor de progesterona no epitélio glandular e no estroma, foi utilizada a técnica de imunoistoquímica. Altas contagens relativas e alta intensidade de marcação para receptor de estrógeno e progesterona no epitélio glandular e no estroma foram observadas nos dois grupos. No entanto, a intensidade de marcação para o receptor de progesterona no epitélio glandular foi mais alta no grupo 2 comparado ao grupo 1. Quando o epitélio glandular e o estroma foram comparados, o número relativo de receptor de estrógeno no grupo 1 foi mais alto no epitélio glandular comparado ao estroma, e a intensidade de marcação para o receptor de progesterona no grupo 2 foi mais alta no epitélio glandular comparado ao estroma. Os resultados sugerem que os mecanismos que controlam a expressão de receptores no anestro são semelhantes aos observados durante o ciclo estral.(AU)

Twenty-four postpartum anestrous Nelore purebred cows were used in the study. Anestrous was determined based on the reproductive history which was confirmed in each cow based on plasma progesterone concentration and by transrectal ultrasonography. Endometrial biopsies were collected. The animals were separated into two groups according to maximum follicular diameter- Group 1: follicles <6mm (n=12) and Group 2: follicles >-6mm follicles (n=12). The immunohistochemistry technique was employed to evaluate the presence of estrogen and progesterone receptors in the uterine glandular epithelium and stroma. High counts of positive nuclei and high intensity of immunostain for estrogen and progesterone receptors in the glandular epithelium and stroma were observed in the two groups. However, the immunostain intensity of progesterone receptors in the glandular epithelium was higher in Group 2 compared to Group 1. When glandular epithelium and stroma were compared within each group, the relative number of estrogen receptors in the Group 1 was higher in the glandular epithelium compared to stroma and the immunostain intensity for the progesterone receptor in Group 2 was higher in the glandular epithelium compared to stroma. The results suggest that the mechanisms that control the expression of endomerial receptors in the anestrus are similar to the ones observed during the estrus cycle.(AU)