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1.
Anim Reprod Sci ; 171: 1-6, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27297178

RESUMO

This study was conducted to determine the effect of supplemental dietary vitamin C (VC) and vitamin E (VE) on improving semen quality and antioxidative status in breeder roosters challenged with dexamethasone (DEX). 120 45-week-old Lveyang black-boned breeder roosters were divided into 5 experimental treatments, including negative group, positive group, and three trial groups, which were fed basal diet supplemented with 300mg/kg VC, 200mg/kg VE, or 300mg/kg VC and 200mg/kg VE (VC+VE). At 49 weeks of age, the positive control and trial groups were subcutaneously injected 3 times every other day with DEX 4 mg/kg body weight, the negative control group was sham injected with saline. At 50 weeks of age, average daily feed intake of birds challenged with DEX significantly increased (P<0.05), however, serum testosterone significantly decreased (P<0.05). Dietary supplementation of VC+VE enhanced serum testosterone and sperm motility remarkably (P<0.05). There were no differences in sperm viability between the DEX-treated groups. During the post-stress recovery period (52 weeks of age), dietary supplementation of VE and VC+VE significantly increased the body weight of birds under oxidative stress (P<0.01). VC, VE, and VC+VE groups had greater sperm viability than control group (P<0.01). Additionally, there was a decrease in the semen plasma malondialdehyde content (P<0.05) of the VC and VC+VE groups, and in the testicular malondialdehyde content (P<0.01) of the VE and VC+VE groups. In summary, VC, VE, especially their combination alleviate the oxidative stress induced by DEX and are favorable for the fertility of breeder roosters.


Assuntos
Ácido Ascórbico/farmacologia , Galinhas/fisiologia , Dexametasona/efeitos adversos , Fertilidade/efeitos dos fármacos , Estresse Oxidativo/efeitos dos fármacos , Vitamina E/farmacologia , Ração Animal , Animais , Anti-Inflamatórios/efeitos adversos , Antioxidantes/administração & dosagem , Antioxidantes/farmacologia , Ácido Ascórbico/administração & dosagem , Suplementos Nutricionais , Masculino , Análise do Sêmen/veterinária , Vitamina E/administração & dosagem
2.
Arch Anim Nutr ; 63(1): 56-65, 2009 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-19271551

RESUMO

An experiment was undertaken to evaluate the effect of dietary selenium (Se) levels on growth performance and immune competence of broilers under heat stress. Birds were raised in either a thermoneutral (TN, 23.9 degrees C constant) or heat stress conditions (HS, 23.9 degrees C to 38 degrees C cycling) and were fed a corn-soybean meal basal diet supplemented with Se at 0, 0.2 and 0.4 mg/kg. A total of 240 one-day-old male broiler chicks were randomly assigned to six groups; each group had four replicates of 10 birds. Body weight and feed intake were not influenced by dietary Se, while feed conversion was significantly improved by a Se-supplementation of 0.2 mg/kg. HS significantly reduced body weight, feed intake and feed conversion. Numbers of abdominal exudate cells (AEC), percentage of macrophages in AEC, phagocytic macrophages, internalized opsonised and unopsonised sheep red blood cells (SRBC) were significantly increased by dietary Se. Both primary and secondary antibody responses were characterised by increasing titres of antibody to SRBC by dietary Se when birds were exposed to HS (p < 0.05). Lymphoid organ weights, antibody responses, incidence of macrophages in AEC, and phagocytic ability of macrophages were also significantly reduced under HS. These results indicated that HS severely reduced growth performance and immunocompetence of broilers, whereas the immune response of broilers improved by dietary Se supplementation under HS.


Assuntos
Galinhas/crescimento & desenvolvimento , Transtornos de Estresse por Calor/veterinária , Imunocompetência/efeitos dos fármacos , Macrófagos/imunologia , Doenças das Aves Domésticas/fisiopatologia , Selênio/farmacologia , Ração Animal , Fenômenos Fisiológicos da Nutrição Animal , Animais , Galinhas/imunologia , Relação Dose-Resposta a Droga , Ingestão de Alimentos , Ingestão de Energia/efeitos dos fármacos , Ingestão de Energia/fisiologia , Exsudatos e Transudatos/citologia , Transtornos de Estresse por Calor/imunologia , Transtornos de Estresse por Calor/fisiopatologia , Temperatura Alta , Masculino , Tamanho do Órgão , Fagocitose , Doenças das Aves Domésticas/imunologia , Distribuição Aleatória , Selênio/administração & dosagem , Aumento de Peso
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