猪几个内分泌性状的表型与遗传特点

实验测定了哈尔滨白猪(简称哈白猪)56日龄经兽用排卵素二号处理后的外周血清促卵泡素和促黄体素的含量;测定了哈白猪、杜洛克猪及杜哈杂种猪4月龄、5月龄和6月龄外周血清孕酮含量;分析了这些内分泌性状、生长发育性状、酮体性状和繁殖性状的表型与遗传特点。实验结果表明,所测内分泌性状表现为中等或低于中等的遗传力(0.1055—0.3363);所测内分泌性状的遗传模型和生统模型为近似累积模型;4月龄外周血清孕酮含量与6月龄背膘厚之间表现为较强的遗传正相关(0.7932);4月龄和5月龄外周血清孕酮含量的遗传特点不同于6月龄外周血清孕酮含量的遗传特点,其原因可能与基因开放的顺序有关。

STUDIES ON THE PHENOTYPIC AND GENETIC CHARACTERISTICS OF SOME ENDOCRINE TRAITS IN PIGS

An experiment was conducted to determine the concentrations of serum FSH and LH in Harbin White pigs at 56 days after LRH-A treatment and the concentrations of serum progestrone in Harbin White, Duroc and Cross-breed (Duroc×Harbin White) at 4, 5 and 6 months. The phenotypic and genetic characteristics of those endocrine traits, some growing traits, a carcass trait and a reproductive trait were analysed. The resuts indicated that: 1. the genetic and biometrieal models of those endocrine traits were expected to be approximate product models; 2. there was no significant difference between male and female groups for those endocrine traits; 3. the concentration of the serum FSH was higher than that of the serum LH in Harbin White at 56 days, which difered from the condition in pituitary gland at maturity; 4. the changing characteristics of the serum progestrone concentrations varied with the varieties of the pigs; 5. the heritabilities of those endocrine traits were middle or low-middle(0.1055—0.3363); 6. there was high positive genetic correlation between the concentration of the serum progestrone at 4 months and the back fat thickness at 6 months(0.7932); 7. most of the genetic correlation coefficients between body weight at birth and body weight at 56 days and body weight at 6 months and back fat thickness at 6 months were middle or up-middle; 8. the genetic characteristics of the serum progestrone concentrations at 4 and 5 months were different from those at 6 months, which might be relative to the order of gene expressions,