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Performance of hair breeds and prolific wool breeds of sheep in southern Illinois: effect of breed of service sire on lamb production of Suffolk and Targhee ewes. 1993

R Bunge, and D L Thomas, and T G Nash, and R L Fernando
Department of Animal Sciences, University of Illinois, Urbana 61801.

The effects of year, age of ewe, sex of lamb, breed of ewe, and breed of service ram on fertility, prolificacy, lamb survival, lamb weaning weight, and ewe productivity of Suffolk and Targhee ewes mated to Finnsheep, Combo-6, Booroola Merino, St. Croix, and Barbados rams were estimated. Matings were in four consecutive years using three rams per breed of service ram each year, with a total of 758 ewe-year observations. There was a significant effect of year on fertility, prolificacy, and ewe productivity. Two- and three-year-old ewes had lowest (P < .05) fertility rates, whereas 3-, 4-, and 5(+)-yr-old ewes had higher (P < .01) prolificacy and ewe productivity than 2-yr-old ewes. Ram lambs were .9 kg heavier (P < .01) at weaning than were ewe lambs. Suffolk ewes gave birth to .13 more (P < .05) lambs per ewe lambing, and their lambs were 1.4 kg heavier (P < .01) than lambs from Targhee ewes. Ewes mated to St. Croix and Barbados rams had higher (P < .10) fertility rates than ewes mated to Finnsheep rams. Lambs sired by Barbados, Finnsheep, and St. Croix rams had higher (P < .05) survival rates to weaning than lambs sired by Booroola Merino rams. The heaviest (P < .01) lambs at weaning were those sired by Finnsheep and Combo-6 rams. Ewes mated to hair-breed rams had greater (P < .05) performance for the fitness traits of fertility and lamb survival but lower (P < .01) lamb weaning weights than ewes mated to wool-breed rams.(ABSTRACT TRUNCATED AT 250 WORDS)

UI MeSH Term Description Entries
D007087 Illinois State bounded on the north by Wisconsin, on the east by Lake Michigan, Indiana, and Kentucky, on the west by Missouri and Iowa, and on the south by Kentucky.
D008297 Male Males
D001947 Breeding The production of offspring by selective mating or HYBRIDIZATION, GENETIC in animals or plants. Breedings
D005260 Female Females
D005298 Fertility The capacity to conceive or to induce conception. It may refer to either the male or female. Fecundity,Below Replacement Fertility,Differential Fertility,Fecundability,Fertility Determinants,Fertility Incentives,Fertility Preferences,Fertility, Below Replacement,Marital Fertility,Natural Fertility,Subfecundity,World Fertility Survey,Determinant, Fertility,Determinants, Fertility,Fertility Determinant,Fertility Incentive,Fertility Preference,Fertility Survey, World,Fertility Surveys, World,Fertility, Differential,Fertility, Marital,Fertility, Natural,Preference, Fertility,Preferences, Fertility,Survey, World Fertility,Surveys, World Fertility,World Fertility Surveys
D000367 Age Factors Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from AGING, a physiological process, and TIME FACTORS which refers only to the passage of time. Age Reporting,Age Factor,Factor, Age,Factors, Age
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
D012737 Sex Factors Maleness or femaleness as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or effect of a circumstance. It is used with human or animal concepts but should be differentiated from SEX CHARACTERISTICS, anatomical or physiological manifestations of sex, and from SEX DISTRIBUTION, the number of males and females in given circumstances. Factor, Sex,Factors, Sex,Sex Factor
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
D014935 Wool The hair of SHEEP or other animals that is used for weaving or felting.

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