Facultad Zootecnia, Universidad Nacional Agraria La Molina, Av. La Molina s/n, La Molina, Lima, Perú.
Unidad de Innovación, Battilana Nutrición SAC, San Borja, Lima, Perú.
Trop Anim Health Prod. 2022 Feb 9;54(2):96. doi: 10.1007/s11250-021-03036-z.
The effect of recombinant somatotropin (rbST) application in cattle has been demonstrated in temperate climate but very limited studies are available in tropical regions. The objective of this study was to compare the effect of the application of two different formulations of rbST on the milk yield and body condition of dairy cattle in a commercial herd under intensive production in Peru. We evaluated the application of 500 mg of active rbST in a zinc sesame oil (ZSO-rbST; n = 44) or vitamin E lecithin (VEL-rbST; n = 45) vehicle while control cows (n = 42) did not receive any application. The application of rbST was performed by every 14 days for 12 cycles, for a total of 168 days. The application of rbST increased the milk production of primiparous and multiparous cows by 3 and 3.2 kg/day for the VEL-rbST formulation respectively when compared with control cows (p < 0.01) and no difference in milk production was observed between the ZSO-rbST formulation and the control group (p > 0.05). However, no significant difference on milk production was observed between the rbST formulations evaluated. The effect of rbST per injection cycle indicated differences in milk production and economic return for the 12 cycles between rbST and control in primiparous group, while in multiparous, no differences were found between ZSO-rbST and control (p > 0.05), but differences were observed between VEL-rbST and control in 41% of the cycles (p < 0.05). No differences in body condition were found between the two rbST formulations and the control group during the evaluation. In conclusion, the application of rbST promoted higher milk production of cattle which had a positive impact on the economic income of the farmer.
重组生长激素（rbST）在牛中的应用效果已在温带气候中得到证实，但在热带地区的相关研究非常有限。本研究的目的是比较两种不同 rbST 制剂在秘鲁集约化生产的商业牛群中对奶牛产奶量和体况的影响。我们评估了每 14 天应用 500mg 活性 rbST 锌芝麻油（ZSO-rbST；n=44）或维生素 E 卵磷脂（VEL-rbST；n=45）制剂，而对照组奶牛（n=42）未接受任何应用。rbST 的应用共进行了 12 个周期，每个周期 168 天，每 14 天应用一次。与对照组相比，VEL-rbST 制剂分别使初产和经产奶牛的产奶量增加了 3 和 3.2kg/天（p<0.01），而 ZSO-rbST 制剂与对照组之间的产奶量没有差异（p>0.05）。然而，两种 rbST 制剂之间的产奶量没有观察到显著差异。每个注射周期 rbST 的效果表明，在初产组的 12 个周期中，rbST 与对照组相比，产奶量和经济回报存在差异，而在经产组中，ZSO-rbST 与对照组之间没有差异（p>0.05），但在 41%的周期中，VEL-rbST 与对照组之间存在差异（p<0.05）。在评估期间，两种 rbST 制剂与对照组之间的体况没有差异。总之，rbST 的应用促进了奶牛产奶量的提高，这对农民的经济收入产生了积极影响。
