终端父本品系和第二次免疫接种时间对免疫去势效果、性能以及胴体和肉质的影响。
Effect of terminal sire line and timing second vaccination on effectiveness of immunocastration, performance, and carcass and meat quality.
机构信息
Flander Research Institute for Agriculture, Fisheries and Food (ILVO), Animal Sciences Unit, Melle, Belgium; Ghent University, Laboratory for Animal Nutrition and Animal Product Quality, Department of Animal Sciences and Aquatic Ecology, Ghent, Belgium.
Ghent University, Laboratory for Animal Nutrition and Animal Product Quality, Department of Animal Sciences and Aquatic Ecology, Ghent, Belgium.
出版信息
Meat Sci. 2021 May;175:108451. doi: 10.1016/j.meatsci.2021.108451. Epub 2021 Jan 29.
Performance (from 10 weeks until slaughter), carcass and meat quality, and effectiveness of immunocastration was compared in crossbred offspring of stress positive (BP+) and negative (BP-) Belgian Piétrain and Canadian Duroc (CD) given the second vaccination of Improvac® at different times (4, 6, 8 weeks before slaughter). CD offspring had a significantly higher daily gain (DG) and feed intake (DFI), and lower predicted lean meat percentage (LMP) and dressing yield compared to BP+ and BP-, while feed conversion ratio (FCR) did not differ. CD offspring had significantly lower drip loss and higher pH intramuscular fat content than BP+ and BP- (except for pH). No significant effect of vaccination time on DG nor FCR was observed. Predicted LMP tended to increase as time-post injection decreased, while meat quality was minor affected. Earlier vaccination had no effect on the effectiveness of immunocastration based on testosterone and GnRH-binding.
性能（从 10 周直到屠宰）、胴体和肉质以及免疫去势的效果在比利时皮特兰（BP+）和加拿大杜洛克（CD）的杂交后代中进行了比较，这些后代在屠宰前 4、6、8 周接受了不同时间的 Improvac®的第二次疫苗接种。与 BP+和 BP-相比，CD 后代的日增重（DG）和饲料摄入量（DFI）更高，预测瘦肉百分比（LMP）和出肉率（Dressing yield）更低，而饲料转化率（FCR）没有差异。CD 后代的滴水损失明显低于 BP+和 BP-，肌肉内脂肪含量较高（除了 pH）。疫苗接种时间对 DG 或 FCR 没有显著影响。预测的 LMP 随着注射后时间的减少而趋于增加，而肉质受影响较小。基于睾酮和 GnRH 结合的免疫去势效果，早期接种对免疫去势效果没有影响。
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