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首页> 外文期刊>Archivos Latinoamericanos de Produccion Animal >Effect of early weaned calves on the reproductive performancein heifers mating al two years old
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Effect of early weaned calves on the reproductive performancein heifers mating al two years old

机译：早期断奶犊牛对两岁小母牛交配繁殖性能的影响

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The reproductive performance of crossbred heifers at first mating wether they were early weaned at calves (DP, 60-90 days, n=706) or grown with their mothers and weaned normally at 5-7 months old (DT, n=35) was evaluated. The research was conducted in three farms in the north of Córdoba province (Argentina). Calves heifers with DP were fed in a pen with a commercial concentrate (18% PB) and hay of Panicum maximun (9% PB) until day 60. They grazed in a pasture either of Panicum maximun ( cv.Gatton) and Cloris gayana (grama rodes), or Cencrhus ciliaris (cv.Texas) depending on the farm, until the moment of the conventional weaning in the control group. Age and initial weight was taken (ranges 63-97 days, and 59,099,0 kg respectivelly) and weight at 180 days (ranges 128-195k y 143-191k en DP y DT respectivelly). Heifer rearing continued grazing deferred C4 grasses trough winter and spring; they stayed at the same pastures during graze regrowth in summer and again on deferred material until next spring, with ureic-mineral suplement. Prior to maiting (24-26mo.) heifers were reproductivelly scored. Those with score ≥ 3 were mated during 75 days (3.5% bulls) (78.4% group DP and 74.3% of DT). No relationship were found between reproductive scoring (p=0.558) or pregnancy rate (p=0.863) and weaning treatment. Neither were found any association between weaning groups and reproductive scoring or pregnancy rates when actual DP and DTPr (DT of previous breeding year) were compared (p=0.432 and p=0.854 respectivelly). In conclusion the DP do not affect the reproductive maturity or performance of crossbred indicus heifers grown under rangeland conditions when bred at two years old.
机译：杂交小母牛在初次交配时的繁殖性能是，他们在犊牛早期断奶（DP，60-90天，n = 706）或与母亲一起成长，并在5-7个月大时断奶（DT，n = 35）。评估。该研究是在科尔多瓦省北部（阿根廷）的三个农场进行的。将带有DP的小牛小母牛饲喂含有商业浓缩物（18％PB）和Pan药（9％PB）的干草，直到第60天。他们在Panicum maximun（cv.Gatton）和Cloris gayana（或农场的Cencrhus ciliaris（cv.Texas），直到对照组常规断奶之时。取年龄和初始体重（范围分别为63-97天和59,099,0 kg）和180天时的体重（范围分别为128-195k和143-191k en DP y DT）。小母牛饲养在冬季和春季继续放牧推迟了C4草。他们在夏季放牧长大时住在相同的草场上，然后再用延期的材料呆到明年春天，并补充尿酸矿物质。发动前（24-26个月），对小母牛进行生殖评分。得分≥3的人在75天内交配（3.5％的公牛）（DP组为78.4％，DT组为74.3％）。生殖评分（p = 0.558）或妊娠率（p = 0.863）与断奶治疗之间没有关系。比较实际的DP和DTPr（上一个育种年的DT）（分别为p = 0.432和p = 0.854）时，断奶组与生殖评分或妊娠率之间没有关联。总之，DP不会影响在牧场条件下两岁时繁殖的杂交印度小母牛的繁殖成熟度或性能。

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