Price S E, Dunnington E A, Siegel P B
Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061-0306, USA.
Poult Sci. 1998 Oct;77(10):1478-80. doi: 10.1093/ps/77.10.1478.
Hematocrits (PCV) were measured at 29 and 106 d of age (PCV1 and PCV2, respectively) in male and female White Plymouth Rocks. Four lines were used, two of which had undergone 40 generations of divergent selection for 8-wk BW (HWS, LWS), and two respective sublines (HWR, LWR), in which selection had been relaxed for five generations. At both ages, males and females did not differ for PCV in lines HWR, LWR, and LWS. For line HWS there was an age by sex interaction that resulted from an age effect for males but not for females, and from a sex effect at each age. At both ages, PCV was higher for the HW than the LW lines. Initially, there was no difference between the selected and their respective relaxed lines, but by 106 d, HWR chickens had a higher PCV than HWS chickens. In lines HWR and LWR, PCV increased with age. There was a negative correlation in HWS males for PCV1 with 28 and 56 d BW. The HWR males also had a negative correlation for PCV1 with BW at 28 d, but not between PCV2 and BW. The correlation for PCV1 with PCV2 was high and positive for HWR males and females.
在29日龄和106日龄时分别测定了白色普利茅斯岩鸡雌雄的血细胞比容（PCV）（分别为PCV1和PCV2）。使用了四个品系，其中两个品系针对8周龄体重进行了40代的 divergent选择（HWS、LWS），以及两个相应的亚系（HWR、LWR），在这两个亚系中选择已经放松了五代。在两个年龄段，HWR、LWR和LWS品系的雌雄PCV没有差异。对于HWS品系，存在年龄与性别交互作用，这是由于雄性有年龄效应而雌性没有，以及在每个年龄都有性别效应。在两个年龄段，HW品系的PCV都高于LW品系。最初，选择品系与其相应的放松品系之间没有差异，但到106日龄时，HWR鸡的PCV高于HWS鸡。在HWR和LWR品系中，PCV随年龄增加。在HWS雄性中，PCV1与28日龄和56日龄体重呈负相关。HWR雄性的PCV1与28日龄体重也呈负相关，但PCV2与体重之间没有相关性。HWR雄性和雌性的PCV1与PCV2的相关性很高且为正相关。
