去势和使用合成代谢植入物对牧场小母牛平均日增重的影响。
The effects of spaying and anabolic implants on the average daily weight gain of heifers on pasture.
作者信息
Zobell D R, Goonewardene L A, Bertagnolli C, Ziegler K
出版信息
Can Vet J. 1993 Dec;34(12):727-30.
Two studies were carried out to determine the effects of spaying and implanting on the growth of heifers and compare Ralgro and Synovex-S for spayed heifers. In the first study, 121 crossbred heifers were randomly allocated to four groups: intact and no implant; intact and progesterone and estradiol benzoate (Synovex-S); spayed and no implant; and spayed and Synovex-S. The average daily gain (ADG) and body weight (BW) data were analyzed as a 2 x 2 factorial experiment with a pasture effect which was considered as a block. Based on ADG for days 0-120, the response to implanting was 17.6% for spayed heifers and 1.8% for intact heifers. In the second study, 31 spayed heifers implanted with zeranol (Ralgro) were compared with 30 spayed heifers implanted with Synovex-S. The data were analyzed as a one-way analysis of variance. The ADG for spayed heifers on Ralgro did not differ significantly (p>0.05) from those implanted with Synovex-S over a period of 92 days, suggesting that both implants produce similar growth responses.
开展了两项研究，以确定去势和植入对小母牛生长的影响，并比较Ralgro和Synovex-S对去势小母牛的作用。在第一项研究中，121头杂交小母牛被随机分为四组：未去势且未植入；未去势且植入孕酮和苯甲酸雌二醇（Synovex-S）；去势且未植入；去势且植入Synovex-S。平均日增重（ADG）和体重（BW）数据作为一个2×2析因试验进行分析，其中将牧场效应视为一个区组。基于第0至120天的ADG，去势小母牛对植入的反应为17.6%，未去势小母牛为1.8%。在第二项研究中，将31头植入玉米赤霉醇（Ralgro）的去势小母牛与30头植入Synovex-S的去势小母牛进行了比较。数据作为单向方差分析进行分析。在92天的时间里，使用Ralgro的去势小母牛的ADG与植入Synovex-S的小母牛相比，差异不显著（p>0.05），这表明两种植入物产生的生长反应相似。
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