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United States Department of Agriculture

Agricultural Research Service

Title: Feedlot Performance of Spring Born Polypay, Romanov, St. Croix and Texel Crossed Lambs Finished During the Summer

item Phillips, William
item Von Tungeln, David
item Brown, Michael

Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 1995
Publication Date: N/A

Technical Abstract: The objective of this study was to determine the feedlot performance and carcass characteristics of Romanov X Polypay (RP), Romanov X St. Croix (RS), Texel X Polypay (TP), Texel X St. Croix (TS) and St. Croix X St. Croix (SS) whether lambs born in the spring and placed in the feedlot in July (Year 1) or August (Year 2). Lambs were blocked by breed and randomly yassigned to one of two pens/breed for a 105-d finishing period. The finishing diet was formulated to contain 11% CP, 1.95 Mcal NE for maint./kg, and 1.27 Mcal NE for gain/kg. Pens were used as the experimental unit and data were analyzed by GLM procedures using a model containing YEAR, BREED, and YEAR X BREED. Lambs in the SS group weighed less (P<.05) at the beginning and end of the finishing period, had the poorest (P<.05) ADG and the lowest gain:DM of the five breed groups. Although SS lambs yielded 18% less (P<.05) shoulder than the TP and TS groups, carcass weights and yield of leg, loin, and rack were not differen (P>.10). Lambs produced from crosses of hair sheep with wool sheep can be finished to acceptable carcass weights.

Last Modified: 4/22/2015
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