seebreeds of cattle,breeds of cattle,breeds of cattle,breeds of pig,breeds of sheepbushbuckorboschbok, bushpig, camelor (Anglo-Indian)oont, Cape buffalo, caribou, chamoisorizard, chevrotainormouse deer, Chinese water deer, cow, deer, dik-dik, dromedary, duikerorduyker, eland, elk, gaur,...
[Lat.,=cattle]. Breeding for improvement of beef and dairy qualities, practiced by the Romans, was established on scientific principles in the middle of the 18th cent. by English livestock breeder Robert Bakewell (seeanimal husbandry;breeding). Important beef breeds includeAngus,Hereford, Simmental...
Several reasons for early sexual maturation in female desert sheep are provided.doi:10.1515/mamm.1982.46.2.183Joel BERGERDe GruyterMammaliaBerger, J. 1982 . Female breeding age and lamb survival in desert bighorn sheep ( Ovis canadensis ). Mammalia 46: 183 – 192 ....
Moreover, early breeding is increasingly accepted as a means of enhancing flock productivity under a wide range of conditions.R. DrmundssonNew Techniques in Sheep ProductionDfrmundsson, 0.R. (1987). Advancement of puberty in male and female sheep. In New Techniques in Sheep Production, pp. ...
In sheep, dizygotic twinning is common and freemartinism does occur, but it is much less common; only 1% of male female co-twins are freemartins. Large-caliber interplacental anastomoses develop infrequently. Freemartinism does occur in goats, complete with hematopoietic chimerism, but is rare ...
Wang Zhichun, 48, raises pigs, cows and sheep in his newly-built pen in a village near the city of Ulanhot in north China's Inner Mongolia Autonomous Region. China to fund Bangladesh for 9th friendship bridge China will fund Bangladesh for construction of the ninth Bangladesh-China Friendship...
PE Chappell,RS White,PL Mellon - 《Journal of Neuroscience the Official Journal of the Society for Neuroscience》 被引量: 192发表: 2003年 Regulation of gonadotropin-releasing hormone (GnRH) receptor gene expression in sheep: interaction of GnRH and estradiol. GnRH and estradiol are important regula...
cyaneus. The dominant male and breeding female gain no immediate fecundity advantage from supernumeraries. 7. Effects on the future survival of dominants ... A Cockburn,R Sims,H Osmond,... 被引量: 225发表: 2008年 Male dominance and immunocompetence in a field cricket Female preference for ...
Therefore, a decrease in photoperiod is necessary for the normal timing of puberty in the spring-born, female sheep, whereas seasonally anoestrous, mature sheep can enter the breeding season at a normal time in the absence of decreasing photoperiod. We suggest that the requirement for a ...
The increasing demand for frozen semen doses has pressured the breeding industry to select fertile bulls at a young age as early as possible. Because ofgenomic selection, it is now possible to recognize potential sires with good genetic material and fertility within weeks of birth, long before ...