2026-09-20T08:59:51Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/20435 2023-07-10 col_2142_5131 col_2142_14771 com_2142_5130 com_2142_685 com_2142_397

Shanks, Roger D. Bunge, Rodrigo 2011-05-07T12:39:07Z 2011-05-07T12:39:07Z 10000-01-01 1992 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. Made available in DSpace on 2011-05-07T12:39:07Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9236405.pdf: 7794254 bytes, checksum: ec0e9a5205e5a323953d18d90529ab4c (MD5) Previous issue date: 1992 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:43:52Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:19:15-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9236405 (UMI)AAI9236405 http://hdl.handle.net/2142/20435 eng Copyright 1992 Bunge, Rodrigo Biology, Genetics Agriculture, Animal Culture and Nutrition Performance of hair breeds and prolific wool breeds of sheep in southern Illinois, United States of America text Animal Sciences Animal Sciences University of Illinois at Urbana-Champaign Dissertation Ph.D.