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- W2964761682 abstract "Abstract Improvements in growth and carcass conformation through terminal sire crossbreeding systems may improve lamb value in a pasture-based system. Therefore, the aim of this study was to replicate the previous model of this experiment and compare the effects of different terminal sires on parasitism, growth, composition and marketability of grazing lambs and lambs at weaning. Suffolk SU (n = 2) and Texel TX (n = 3) sires were mated to commercial ewes at the WVU Organic Farm. April-born lambs were managed as one group until weaning in mid-June. One group containing TX (n = 28) and SU (n = 22) was sold at weaning, the other group was sorted into 3 replicates per sire breed. Lambs were rotationally grazed for 62-d with paddock movements every 10-d. Lambs were supplemented at a rate of 2% of bodyweight with a 16% CP corn-soybean meal supplement. Weights and FAMACHA were collected at weaning and then weekly for the duration of the study. Fecal egg counts (FEC) and packed cell volumes (PCV) were collected bi-weekly. Lambs were dewormed when FAMACHA score was a 3 or greater. Ultrasound measures of rib eye area (REA) and fat depth were obtained at study conclusion and lambs were marketed at the same graded auction as the group sold at weaning. There was no significant difference in FEC and PCV data values during project duration (P = 0.32) (P = 0.19). Fewer deworming treatments were necessary in TX-sired lambs at 19% (7/36) whereas SU-sired lambs required 42% (15/36) (P = 0.04). REA and fat depth measurements were not significant between sired breeds (P = 0.21) (P = 0.50). Texel-sired lambs received a $0.26/Kg greater premium than the SU-sired lambs at weaning. Texel-sired lambs received a $0.29/Kg greater premium than the SU-sired lambs after the conclusion of grazing. These data demonstrate that Texel-sired lambs required fewer dewormer treatments and received premiums when marketed at a graded auction." @default.
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- W2964761682 date "2020-11-01" @default.
- W2964761682 modified "2023-09-23" @default.
- W2964761682 title "45 Effect of terminal sire breed on grazing performance, parasitism, and market grade of crossbred lambs: year 2" @default.
- W2964761682 doi "https://doi.org/10.1093/jas/skz397.162" @default.
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