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首页> 外文期刊>Tropical Animal Health and Production >Reproductive and productive performances of Santa Ins ewes submitted to breeding in different periods of the Amazonian humid tropical climate
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Reproductive and productive performances of Santa Ins ewes submitted to breeding in different periods of the Amazonian humid tropical climate

机译：在亚马孙湿润热带气候不同时期繁殖的圣塔因斯母羊的生殖和生产性能

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摘要

The objective of this study was to evaluate the reproductive and productive performance of Santa Ins ewes bred at different times of the year in humid tropical climate. One hundred and forty-eight Santa Ins ewes were grouped according to the time of the year of their breeding season (i.e., mating period) (dry/wet, wet, wet/dry, and dry season). The service type was natural mating and the ewes and rams were kept together every night for 45 days. Reproductive efficiency was assessed by service, pregnancy, lambing, prolificacy, twinning, pregnancy loss, weaning, and lamb mortality rates. Ewes were weighed at the beginning and at the end of the breeding season and before and after parturition, and sequential weighing of the lambs was performed (at birth, 15, 30, 60, and 90 days). Reproductive efficiency index (number of lambs weaned/total of served ewes) and productive efficiency (kg of weaned lamb/kg of served or lambed ewes) were calculated. All ewes expressed estrus early in the breeding season; however, a higher percentage (53.5 and 7.1 % at 30 and 45 days, respectively) of ewes returned to estrus during the wet/dry period. The lower rates (13.9 %) of return to estrus at 30 days were during the wet season (P < 0.05). There were no (P > 0.05) effects of breeding seasons on the remaining reproductive rates. Ewes that lambed during the wet/dry transition period weighted less, before (40.5 +/- 2.5 kg) and after (38.6 +/- 1.6 kg) parturition, than those of other groups (P < 0.05). Lamb weight at birth did not vary between groups, however, weight at weaning was higher (15.6 +/- 2.1 kg) in lambs born during the wet season (P < 0.05). The reproductive efficiency index was lower (0.66) when the breeding season took place during the dry/wet period (P < 0.05). Productive rates were significantly higher (0.29 and 0.33 for kg of weaned lamb/kg of served and lambed ewes, respectively; P < 0.05) in ewes served in the dry season. The reproductive performance of Santa Ins ewes was not significantly influenced by the period of the year in which the breeding seasons took place, allowing for four breeding seasons a year in the Amazon region. Variations between periods in return to estrus rates, weight of ewes close to parturition and lamb weight at weaning indicate that climate changes can also affect reproductive rates.
机译：这项研究的目的是评估在潮湿的热带气候下一年中不同时间繁殖的圣诞老人Ins母羊的繁殖和生产性能。根据其繁殖季节（即交配期）（干燥/湿润，湿润，湿润/干燥和干燥季节）的一年中的时间将148只Santa Ins母羊分组。服务类型为自然交配，母羊和公羊每晚保持45天。通过服务，怀孕，产羔，多产，双胎，流产，断奶和羔羊死亡率评估生殖效率。在繁殖季节的开始和结束以及分娩前后，对母羊进行称重，并依次称重羔羊（在出生时，15、30、60和90天）。计算了生殖效率指数（断奶的羔羊数/所食用的母羊总数）和生产效率（断奶的羔羊kg /所食用或羔羊的母羊kg）。在繁殖季节的早期，所有母羊都表现出发情。然而，在干/湿期间，较高百分比的母羊（分别在30天和45天时分别为53.5和7.1％）返回到发情期。 30天时发情恢复率较低（13.9％）是在雨季（P <0.05）。繁殖季节对其余繁殖率没有影响（P> 0.05）。在湿/干过渡期产羔的母羊在分娩前（40.5 +/- 2.5千克）和分娩后（38.6 +/- 1.6千克）比其他组少（P <0.05）。两组之间出生时的羔羊体重没有变化，但是在雨季出生的羔羊断奶时的体重较高（15.6 +/- 2.1 kg）（P <0.05）。当在干/湿期繁殖季节时，繁殖效率指数较低（0.66）（P <0.05）。旱季使用的母羊的生产率显着更高（每公斤断奶羔羊和每公斤羔羊母羊的生产率分别为0.29和0.33; P <0.05）。 Santa Ins母羊的繁殖性能不受繁殖季节的一年的影响，在亚马逊地区每年有四个繁殖季节。回情率，接近分娩的母羊体重和断奶时羔羊体重的不同时期之间的差异表明，气候变化也可能影响繁殖率。

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