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首页> 外文期刊>Reproduction in Domestic Animals >Effects of breeding at the second oestrus or after post-weaning hormonal treatment with altrenogest on subsequent reproductive performance of primiparous sows.
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Effects of breeding at the second oestrus or after post-weaning hormonal treatment with altrenogest on subsequent reproductive performance of primiparous sows.

机译：次发情期或断奶后荷尔蒙诺孕激素治疗后繁殖对初生母猪随后繁殖性能的影响。

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摘要

This study investigated the effects of breeding at the second oestrus after weaning or after feeding an orally active progestagen (altrenogest) on the subsequent reproductive performance of primiparous sows. After 3 weeks of lactation, 663 weaned sows of two genotypes were allocated into three groups: G1 - breeding at the first oestrus after weaning; G2 - breeding at the second oestrus after weaning and G3 - treatment with altrenogest for 5 days after weaning and breeding at the first oestrus after the end of the treatment. Body weight at breeding was lower in G1 and G3 than in G2 sows (p<0.05). The interval to show oestrus was similar for G1 and G2 groups (p>0.05) but higher (p<0.05) than that observed in G3 group. Within genotype A, percentages of females in oestrus within 10 days were not different (p>0.05) among groups, whereas in genotype B, more G1 and G2 sows (p<0.05) showed oestrus than G3 sows. In both genotypes, lower farrowing rates were observed in G3 than in G1 and G2 sows (p<0.05) and a greater litter size (p<0.05) was observed in G2 sows. In genotype A, the number of total born piglets was similar for G1 and G3 groups (p>0.05), whereas in genotype B, G1 sows had a greater litter size than G3 sows (p<0.05). Body weight at weaning and at breeding was similar (p>0.05) between farrowed and non-farrowed sows in all groups. Reproductive performance is not improved in primiparous sows treated with altrenogest during 5 days after weaning. The reproductive performance of genotype B sows is compromised in Control and Altrenogest-treated sows but not in those bred at the second oestrus after mating. Breeding at the second oestrus after weaning allows primiparous sows to gain weight between weaning and service, and increases their farrowing rate and subsequent litter size.
机译：这项研究调查了断奶后或饲喂口服活性孕激素（altrenogest）后第二个发情期的繁殖对初生母猪随后繁殖性能的影响。泌乳三周后，将663种两种基因型的断奶母猪分为三组：G1-断奶后的第一个发情期繁殖; G2-断奶后在第二个发情期繁殖，G3-断奶后5次用altrenogest处理，并在治疗结束后的第一个发情期繁殖。 G1和G3母猪的繁殖体重低于G2母猪（p <0.05）。 G1和G2组的发情间隔相似（p> 0.05），但高于G3组（p <0.05）。在基因型A中，各组之间10天内发情的雌性百分比无差异（p> 0.05），而在基因型B中，G1和G2母猪的发情比G3母猪多（p <0.05）。在两种基因型中，G3母猪的产仔率均低于G1和G2母猪（p <0.05），G2母猪的产仔数更大（p <0.05）。在基因型A中，G1和G3组的总出生仔猪数量相似（p> 0.05），而在基因型B中，G1母猪的产仔数大于G3母猪（p <0.05）。在所有组中，分娩和未分娩的母猪在断奶和育种时的体重相似（p> 0.05）。断奶后5天内用altrenogest治疗的初生母猪的生殖性能没有改善。 B型母猪的繁殖性能在对照和经Altrenogest处理的母猪中受损，但在交配后第二个发情期繁殖的母猪中则没有。断奶后在第二个发情期进行育种，可使初生母猪在断奶和服务之间增加体重，并增加其产仔率和随后的产仔数。

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