@article {51836,
	title = {Effects of nutritional environment and ram effect on breeding season in range sheep},
	journal = {Theriogenology},
	volume = {25},
	number = {2},
	year = {1986},
	note = {Reprinted with permission from Elsevier, Copyright {\textcopyright} 1986. (http://www.sciencedirect.com/science/journal/0093691X)},
	month = {February 1, 1986},
	pages = {317-323},
	abstract = {Effects of season, nutritional environment, and presence of rams on incidence and rate of ovulation in fine-wool sheep in southern New Mexico were investigated over 14 months (February 1983{\textendash}March 1984). Number of corpora lutea (CL) were observed each month by laparoscopy in random samples from six ewes in each subgroup. Seasonality of ovulation in fine-wool sheep managed on range was much more marked than in animals managed on alfalfa hay in drylot. Incidence of ovulation approached zero in range-managed ewes during May, June, and July (8\%, 0\%, 4\%) but was higher (P<0.05) in the alfalfa-drylot group (42\%, 17\%, 75\%), respectively. Although the incidence remained lower (P<0.05) in August in range-managed than in drylot ewes (50\% and 83\%, respectively), both groups were ovulating at a high rate during September through January. Incidence of ovulation dropped dramatically both years in the range-managed group in February compared with that of the alfalfa-drylot group (48\% and 36\% vs 100\% and 83\%). Mean ovulation rate per ewe ovulating did not differ (P>0.10) between nutrition groups within the 14 months. Body weight was related to CL number during periods of seasonal transition only. Continuous or intermittent presence of a ram had no real effect on either incidence or rate of ovulation during the transitional months. Nutritional environment can affect seasonality of breeding in fine-wool range sheep. This effect may not be consistently modified by presence of rams.},
	keywords = {breeding season, nutrition, ovulation, ram effect, range sheep},
	url = {/files/bibliography/300.pdf},
	author = {Clarence V. Hulet and Shupe, W. Larry and Ross, T.T. and Richards, W.A.}
}
