This study was designed to examine the effects of dietary energy levels on some growth and reproductive parameters of local barred chickens in Cameroon. For this purpose, One hundred and forty four day-old barred male...This study was designed to examine the effects of dietary energy levels on some growth and reproductive parameters of local barred chickens in Cameroon. For this purpose, One hundred and forty four day-old barred male chicks, weighing 28.33 g in average were randomly divided into 12 groups of 12 chicks each. Three feeding programs (FP) comprising each a starter diet from day old to 12 weeks (S0: 2800 Kcal/Kg;S1: 2900 Kcal/Kg;S2: 3000 Kcal/Kg) and grower diet from 13 to 20 weeks (G0: 2900 Kcal/Kg;G1: 3000 Kcal/ Kg;G2: 3100 Kcal/Kg) were used and designated FP1, FP2 and FP3 respectively. Each of the FP was randomly allotted of 4 groups of 12 birds in a completely randomized design. Throughout experiment (1 day old to 20 weeks), body weight was recovered every 2 weeks. At 20 weeks of age, roosters were sacrificed;semen characteristic was analyzed and testes were characterized. Between 2 to 10 weeks old, body weight of cocks fed with FP3 was significantly higher (P < 0.05) as compared to others FP. Inversely, from 12 to 20 weeks, body weight of cocks receiving FP1 was significantly higher (P < 0.05) than that of cocks receiving feeding programs 2 and 3. At 20 weeks, 100% of cocks fed on FP3 produced semen versus 66.66% and 16.66% respectively for those on FP1 and FP2. Semen volume and mass motility of cocks fed on FP3 or FP1 were significantly (P < 0.05) higher than FP2. It was concluded that FP1 had more suitable dietary energy levels for growth and reproduction of local barred cocks.展开更多
将葡萄糖、氯化钠、氯化钾、柠檬酸钠四种物质分别配制成三个渗透压水平(278m O sm、328m O sm、378m O sm)的12种单方精液稀释液,在低温(1～4℃)下进行鸡精液稀释保存试验,在四种物质中各选出一种好的稀释液,再将所选四种单方稀释液按...将葡萄糖、氯化钠、氯化钾、柠檬酸钠四种物质分别配制成三个渗透压水平(278m O sm、328m O sm、378m O sm)的12种单方精液稀释液,在低温(1～4℃)下进行鸡精液稀释保存试验,在四种物质中各选出一种好的稀释液,再将所选四种单方稀释液按不同比例制成复方精液稀释液,再次进行保存试验。所有稀释液均测定渗透压、pH值、缓冲指数、精子存活时间、精子生存指数等指标。结果表明:①柠檬酸钠、葡萄糖对鸡精液的保存具有重要作用,而氯化钾在鸡精液稀释液中并不是必需的。②复方稀释液保存效果普遍优于单方稀释液。③低温下鸡精液稀释液渗透压应为等渗或接近等渗,且最适渗透压还与构成稀释液的物质种类和相互配比有关系。④稀释液pH值应接近中性,最好与精液pH值保持一致。⑤在缓冲指数为3.894～7.257的范围内,缓冲指数与精子存活时间和生存指数呈现显著的负相关。展开更多
文摘This study was designed to examine the effects of dietary energy levels on some growth and reproductive parameters of local barred chickens in Cameroon. For this purpose, One hundred and forty four day-old barred male chicks, weighing 28.33 g in average were randomly divided into 12 groups of 12 chicks each. Three feeding programs (FP) comprising each a starter diet from day old to 12 weeks (S0: 2800 Kcal/Kg;S1: 2900 Kcal/Kg;S2: 3000 Kcal/Kg) and grower diet from 13 to 20 weeks (G0: 2900 Kcal/Kg;G1: 3000 Kcal/ Kg;G2: 3100 Kcal/Kg) were used and designated FP1, FP2 and FP3 respectively. Each of the FP was randomly allotted of 4 groups of 12 birds in a completely randomized design. Throughout experiment (1 day old to 20 weeks), body weight was recovered every 2 weeks. At 20 weeks of age, roosters were sacrificed;semen characteristic was analyzed and testes were characterized. Between 2 to 10 weeks old, body weight of cocks fed with FP3 was significantly higher (P < 0.05) as compared to others FP. Inversely, from 12 to 20 weeks, body weight of cocks receiving FP1 was significantly higher (P < 0.05) than that of cocks receiving feeding programs 2 and 3. At 20 weeks, 100% of cocks fed on FP3 produced semen versus 66.66% and 16.66% respectively for those on FP1 and FP2. Semen volume and mass motility of cocks fed on FP3 or FP1 were significantly (P < 0.05) higher than FP2. It was concluded that FP1 had more suitable dietary energy levels for growth and reproduction of local barred cocks.
文摘将葡萄糖、氯化钠、氯化钾、柠檬酸钠四种物质分别配制成三个渗透压水平(278m O sm、328m O sm、378m O sm)的12种单方精液稀释液,在低温(1～4℃)下进行鸡精液稀释保存试验,在四种物质中各选出一种好的稀释液,再将所选四种单方稀释液按不同比例制成复方精液稀释液,再次进行保存试验。所有稀释液均测定渗透压、pH值、缓冲指数、精子存活时间、精子生存指数等指标。结果表明:①柠檬酸钠、葡萄糖对鸡精液的保存具有重要作用,而氯化钾在鸡精液稀释液中并不是必需的。②复方稀释液保存效果普遍优于单方稀释液。③低温下鸡精液稀释液渗透压应为等渗或接近等渗,且最适渗透压还与构成稀释液的物质种类和相互配比有关系。④稀释液pH值应接近中性,最好与精液pH值保持一致。⑤在缓冲指数为3.894～7.257的范围内,缓冲指数与精子存活时间和生存指数呈现显著的负相关。
