摘要
The objective of this project was to characterize changes in growth, carcass yield, and meat quality traits in castrates and gilts in response to divergent selection for testosterone production. In generation 21, endogenous testosterone concentrations in Duroc boars of the high (HTL) and low (LTL) testosterone lines averaged 49.0 and 27.8 ng/mL (P < 0.01), respectively. Eight LTL and 10 HTL boars were used to sire 29 LTL and 33 HTL litters. To remove the effects of inbreeding, these same boars were mated to females of a Large White × Landrace composite (WC) to generate 11 WC by LTL litters (WLT) and 23 WC by HTL litters (WHT). Castrates and gilts were then allotted to LTL (n = 53), HTL (n = 61), WLT (n = 102), and WHT (n = 101) for testing. Growth and carcass traits analyzed included days to 114 kg (D114), ADG, backfat adjusted to 114 kg (ABF), LM area adjusted to 114 kg and predicted percent lean (PPL). Fat-O-Meater data collected were adjusted fat depth (AFD), adjusted loin depth, and percent lean. Meat quality traits characterized at 24 h postmortem included marbling score, percent lipid, pH, drip loss, color score, and Minolta L*, a*, and b*. Data were analyzed with a mixed model including fixed effects of line, mating type (purebred or crossbred), sex, and the random effect of sire nested within line. All possible interactions among fixed effects were tested. The HTL had fewer D114 (P < 0.05), greater ADG (P < 0.01), greater ABF (P < 0.01), and lower PPL (P < 0.01) than LTL. The WHT and WLT did not differ for D114, ADG, or ABF. The WHT had smaller LM area adjusted to 114 kg (P < 0.05) and greater drip loss (P < 0.05) than WLT. The WLT had lower adjusted loin depth (P < 0.05) than LTL and HTL. The LTL and HTL had greater subjective scores for marbling (P < 0.05) compared with WLT and WHT. The least squares mean for percent lipid for HTL and LTL was 4.00. The WHT had greater means for L*, a*, and b* (P < 0.05) than WLT. Pigs selected for increased testosterone production grew faster and produced fatter carcasses than pigs selected for decreased testosterone. Changes in growth, carcass yield, and meat quality traits were detected in castrates and gilts in response to divergent selection for testosterone production.
摘要译文
这个项目的目标是描述阉割和后备母猪的生长，胴体产量和肉质性状的变化，以响应睾酮生产的不同选择。在第21代，高（HTL）和低（LTL）睾酮系的杜洛克公猪的内源性睾酮浓度平均分别为49.0和27.8 ng / mL（P 0.01）。使用8只LTL和10只HTL公猪用于驯养29只LTL和33只HTL幼仔。为了消除近亲繁殖的影响，将这些公猪与大白×长白复合体（WC）的雌性交配以通过LTL窝（WLT）产生11 WC，并通过HTL产仔（WHT）产生23 WC。然后将阉割和后备母猪分配给LTL（n \x3d 53），HTL（n \x3d 61），WLT（n \x3d 102）和WHT（n \x3d 101）进行测试。分析的生长和胴体性状包括天数达114公斤（D114），ADG，背部脂肪调整到114公斤（ABF），LM区域调整到114公斤并预测瘦肉百分比（PPL）。收集的Fat-O-Meater数据是调整脂肪深度（AFD），调整腰部深度和瘦肉百分比。以屠宰后24小时为特征的肉质特征包括大理石花纹评分，脂质百分比，pH值，滴水损失，颜色评分和Minolta L *，a *和b *。数据采用混合模型进行分析，包括线的固定效应，交配类型（纯种或杂交），性别以及巢内父系的随机效应。测试了固定效应之间所有可能的相互作用与LTL相比，HTL具有更少的D114（P 0.05），更大的ADG（P 0.01），更大的ABF（P 0.01）和更低的PPL（P 0.01）。对于D114，ADG或ABF，WHT和WLT没有差异。 WHT与WLT相比，LM面积调整到114 kg（P 0.05）和更大的滴水损失（P 0.05）。 WLT调整后的腰部深度较低（P 0。05）比LTL和HTL。与WLT和WHT相比，LTL和HTL对大理石花纹的主观评分较高（P 0.05）。 HTL和LTL的脂质百分比的最小二乘平均值为4.00。对于L *，a *和b *，WHT具有比WLT更大的手段（P 0.05）。选择用于增加睾酮产生的猪生长得更快，并且产生比选择用于降低睾酮的猪更加肥胖的胴体。增长，胴体产量，并在阉割和后备母猪中检测到肉类质量性状，以响应睾酮产生的不同选择。
J. M. Bender;M. T. See;D. J. Hanson;T. E. Lawrence;J. P. Cassady. Correlated responses in growth, carcass, and meat quality traits to divergent selection for testosterone production in pigs[J]. Journal of Animal Science, 2006,84(6): 1331–1337