Biomaterial Database

Production of fine-wool ewes on yearlong rangeland in West Texas. II. Effects of supplemental feed and breeding frequency on reproductive rate. 1983

J E Huston

Reproductive rate was compared in once-a-year and accelerated lambing ewes given various winter supplemented feed treatments during a 4-yr study. The study involved 165 commercial Rambouillet ewes. The accelerated lambing ewes had a lower attrition rate (P = .20) and final weight (P less than .05) and produced more lambs (P less than .01), lighter weight lambs at birth (P less than .05) and weaning (P less than .01), a lower frequency of twins (P less than .05) and an equal total weight of weaned lamb (P greater than .25) compared with once-a-year lambing ewes. Significant effects of feeding were detected only in a higher attrition rate in fed vs control ewes (P less than .02) and in a higher twinning frequency in fed vs control ewes (P less than .05). It is suggested that attrition rate is positively associated with twinning frequency. Accelerated lambing failed to substantially increase total lamb production, primarily because fall-lambing ewes failed to rebreed for summer lambs in spite of supplemental feed and as a result, continued in a fall lambing pattern.

UI	MeSH Term	Description	Entries
D012098	Reproduction	The total process by which organisms produce offspring. (Stedman, 25th ed)	Human Reproductive Index,Human Reproductive Indexes,Reproductive Period,Human Reproductive Indices,Index, Human Reproductive,Indexes, Human Reproductive,Indices, Human Reproductive,Period, Reproductive,Periods, Reproductive,Reproductive Index, Human,Reproductive Indices, Human,Reproductive Periods
D001947	Breeding	The production of offspring by selective mating or HYBRIDIZATION, GENETIC in animals or plants.	Breedings
D005260	Female		Females
D005527	Food, Fortified	Any food that has been supplemented with essential NUTRIENTS either in quantities that are greater than those normally present, or which are not found in the food typically. Fortified food also includes food enriched by adding various nutrients to compensate for those removed by refinement or processing. (Modified from Segen, Dictionary of Modern Medicine, 1992).	Enriched Food,Food, Supplemented,Enriched Foods,Food, Enriched,Foods, Enriched,Foods, Fortified,Foods, Supplemented,Fortified Food,Fortified Foods,Supplemented Food,Supplemented Foods
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D000821	Animal Feed	Foodstuff used especially for domestic and laboratory animals, or livestock.	Fodder,Animal Feeds,Feed, Animal,Feeds, Animal,Fodders
D012756	Sheep	Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.	Ovis,Sheep, Dall,Dall Sheep,Ovis dalli
D013781	Texas	State bounded on the north by Oklahoma, on the east by Arkansas and Louisiana, on the south by Mexico, and on the west by New Mexico.