Borg K E, Lunstra D D, Christenson R K
USDA, ARS, Reproduction Research Unit, Roman L. Hruska, U.S. Meat Animal Research Center, Clay Center, Nebraska 68933.
Biol Reprod. 1993 Sep;49(3):515-21. doi: 10.1095/biolreprod49.3.515.
Chinese breeds of swine are known for their reproductive prolificacy and are noted for large litter size. The current investigation evaluated reproductive components of three breeds of Chinese boars in comparison to a contemporary site breed common in the U.S. Semen from postpubertal Duroc, Meishan, Fengjing, and Minzhu boars was collected during four seasons of the year. After each semen collection and evaluation period, boars were weighted and placed in a restraining chute for testicular measurements and blood sampling for measurement of FSH, testosterone, and inhibin. Although Duroc boars were 2 mo younger than Chinese boars, initial and final body weight and paired testis volume in Durocs were greater (p < 0.05) than in Chinese boars. Total spermatozoa per ejaculate was similar for Duroc and Minzhu boars, but was lower (p < 0.05) in Fengjing and Meishan boars. Progressive motility and sperm morphological characteristics were not affected by breed of boar. Serum FSH concentrations were markedly higher (p < 0.01) in Meishan and Fengjing boars than in other breeds, and concentrations were nearly 8-fold higher in Meishan than in Duroc boars. Breed differences in serum inhibin were essentially the inverse of those observed for FSH, with Durocs exhibiting the highest inhibin concentrations and Meishans exhibiting the lowest. Testosterone values were not different between breeds. However, testosterone concentrations fluctuated with season, and serum testosterone was highest during the fall of the year in all breeds. These results indicated that some reproductive characteristics differ dramatically between Duroc and Chinese breeds of boars. Breed differences existed in body size, testis size, sperm per ejaculate, ejaculate volume, and serum FSH and inhibin concentrations.(ABSTRACT TRUNCATED AT 250 WORDS)
中国猪种以其繁殖力高和产仔数多而闻名。本研究评估了三种中国公猪的生殖组成部分，并与美国常见的一个当代本地品种进行了比较。在一年的四个季节中，采集了青春期后杜洛克、梅山、枫泾和民猪公猪的精液。在每次精液采集和评估期后，对公猪进行称重，并将其放入限制栏中进行睾丸测量和血液采样，以测量促卵泡激素（FSH）、睾酮和抑制素。尽管杜洛克公猪比中国公猪小2个月，但杜洛克公猪的初始体重、最终体重和双侧睾丸体积均大于中国公猪（p<0.05）。杜洛克和民猪公猪每次射精的总精子数相似，但枫泾和梅山公猪的总精子数较低（p<0.05）。公猪品种不影响精子的前向运动性和形态特征。梅山和枫泾公猪的血清FSH浓度显著高于其他品种（p<0.01），梅山公猪的血清FSH浓度几乎是杜洛克公猪的8倍。血清抑制素的品种差异与FSH基本相反，杜洛克公猪的抑制素浓度最高，梅山公猪的最低。各品种间睾酮值无差异。然而，睾酮浓度随季节波动，所有品种的血清睾酮在秋季最高。这些结果表明，杜洛克公猪和中国公猪的一些生殖特征存在显著差异。在体型、睾丸大小、每次射精的精子数、射精量以及血清FSH和抑制素浓度方面存在品种差异。（摘要截断于250字）
