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首页> 外文期刊>Theriogenology >Effect of growth and development during the rearing period on the subsequent fertility of nulliparous Holstein-Friesian heifers
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Effect of growth and development during the rearing period on the subsequent fertility of nulliparous Holstein-Friesian heifers

机译：孕育期生长发育对未产荷斯坦-弗里斯兰小母牛后续生育力的影响

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This study investigated the effect of growth parameters and metabolic indices during the rearing period on the fertility of nulliparous Holstein-Friesian heifers managed on 17 UK dairy farms. Growth parameters (body weight [BW], heart girth, height, and crown-rump length) and metabolic indices (insulin-like growth factor-I [IGF-1], insulin, glucose, and urea) were measured at approximately 30, 180, and 450 d of age. Fertility data collected included age at first breeding (AFB), number of services per conception, pregnancy rate to first artificial insemination (AI), and age at first calving (AFC). Of the heifers initially bred (n = 428). 4% failed to conceive. The mean pregnancy rate to first AI for heifers that conceived and calved without suffering reproductive loss: (n = 392) was 67%, and 6% required >2 inseminations. The mean AFB and AFC was 473 5 d (range, 357 to 936 d) and 791 +/- 6 d (range, 636 to 1529 d), respectively. Increased BW, girth, and IGF-I concentration (at 30, 180, and 450 d) and increased skeletal growth (at 180 and 450 d) was associated with a reduced AFB and AFC (P < 0.05 to 0.001). Heifers calving at <775 d had a mean BW gain of 0.82 0.01 kg from 30 to 180 d. Increased glucose concentration at 180 d was associated with a reduced AFB (P < 0.01), but no associations were found between insulin and urea concentrations and any of the fertility traits recorded (P > 0.1). Suboptimal growth associated with an increased AFC could be alleviated by improved monitoring of replacement heifers during the rearing period.
机译：这项研究调查了饲养期间生长参数和代谢指标对英国17个奶牛场管理的未产卵荷斯坦-弗里斯牛的育性的影响。测量生长参数（体重[BW]，心脏周长，身高和冠臀长）和代谢指标（胰岛素样生长因子-I [IGF-1]，胰岛素，葡萄糖和尿素），大约为30， 180和450 d的年龄。收集的生育率数据包括初育年龄（AFB），每胎的服务次数，初次人工授精的怀孕率（AI）和初产犊的年龄（AFC）。最初繁殖的小母牛（n = 428）。 4％未能怀孕。受孕和产犊但未遭受生殖损失的小母牛的首次AI的平均怀孕率：（n = 392）为67％，需要6％的人工授精> 6％。平均AFB和AFC分别为473 5 d（范围为357至936 d）和791 +/- 6 d（范围为636至1529 d）。 BW，周长和IGF-I浓度增加（在30、180和450 d时）和骨骼生长增加（180和450 d）与AFB和AFC降低有关（P <0.05至0.001）。在<775 d时产犊的小母牛在30到180 d时平均体重增加0.82 0.01 kg。 180 d时葡萄糖浓度升高与AFB降低有关（P <0.01），但未发现胰岛素和尿素浓度与所记录的任何生育性状之间存在关联（P> 0.1）。在饲养期间，通过改进对替代小母牛的监测，可以缓解与AFC增加有关的次优生长。

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