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Title:Performance of hair breeds and prolific wool breeds of sheep in southern Illinois, United States of America
Author(s):Bunge, Rodrigo
Doctoral Committee Chair(s):Shanks, Roger D.
Department / Program:Animal Sciences
Discipline:Animal Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Biology, Genetics
Agriculture, Animal Culture and Nutrition
Abstract:Three prolific wool-breeds (Finnsheep, Combo-6 and Booroola Merino) and 2 hair-breeds (St. Croix and Barbados) were evaluated. Suffolk and Targhee ewes were exposed to rams (3 rams per breed per year) of these 5 breeds. Results indicated that ewes mated to hair-breed rams had higher fertility and their lambs had higher survival to weaning than ewes mated to wool-breed rams, suggesting a better reproductive performance of ewes mated to hair-breed rams.
F$\sb1$ ewe lambs resulting from the previous matings were mated to Dorset rams. F$\sb1$ ewe lambs from hair-breed sires reached puberty later, were lighter at breeding and had a shorter breeding to lambing interval than F$\sb1$ ewe lambs from wool-breed sires. Hair-breed-sired F$\sb1$ ewe lambs had higher fertility, less lambs born per ewe lambing and weaned more of lamb per ewe lamb exposed than F$\sb1$ ewe lambs sired by wool-breed rams suggesting a superior adaptability of the hair-breeds over the wool-breeds to the environment in southern Illinois.
These F$\sb1$ ewe lambs were also mated to Dorset rams when they were 1$\sp{1/2}$ and 2$\sp{1/2}$ years old. F$\sb1$ ewes from hair-breed sires were lighter at breeding, ovulated less and conceived to a ram earlier than F$\sb1$ ewes from wool-breed sires. Adult F$\sb1$ ewes from hair-breed sires had higher fertility, higher ewe productivity and their lambs had higher survival and weighed less at weaning than those from wool-breed sires. These results together with those from Suffolk and Targhee ewes and F$\sb1$ ewe lambs suggest that the productivity of ewes mated to or sired by hair-breed rams is superior to that of ewes mated to or sired by wool-breed rams.
Issue Date:1992
Type:Text
Language:English
URI:http://hdl.handle.net/2142/20435
Rights Information:Copyright 1992 Bunge, Rodrigo
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9236405
OCLC Identifier:(UMI)AAI9236405


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