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• W3004984670 abstract "The objective of this experiment was to compare overall productivity between Dorper (n = 96) and Rambouillet (n = 100) ewes in West Texas commercial production conditions. Ewes originated from private flocks and were mated to produce terminal cross or purebred lambs, depending upon the year. These ewes generated 1,091 records of reproductive performance and lamb weights. Ewe traits included weight at the beginning of the fall breeding season, fertility (ewes that gave birth per ewe exposed), condition score, lambing interval, and stayability to 9 years of age. Mixed linear models included flock of origin and ewe as random effects. Fixed effects included the age of the ewe nested within year of record (P < 0.001 all analyses). Ewe longevity assessed using survival analysis included the effect of birth year of the ewe. Analyses of lamb birth weight and weaning weight included the type of birth (litter size: singles, twins, triplets) and sex (P < 0.0001) as fixed effects. Lamb weaning weight included lamb age in days as a linear covariate (0.33 ± 0.013 kg; P < 0.0001). Fertility did not differ between ewe breeds (P> 0.05). Dorper ewes had higher condition score (3.02 ± 0.08), more lambs born per litter (1.6 ± 0.05) and shorter lambing intervals (386 ± 6.6 d) than Rambouillet ewes (2.69 ± 0.077, 1.4 ± 0.05, 403.3 ± 6.1 d, respectively). Dorper ewe weight (66.9 ± 1.3 kg) and stayability (0.69 ± 0.03) tended (0.08 < P < 0.13) to be lower than that of Rambouillet ewes (69.8 ± 1.3 kg, 0.77 ± 0.03, respectively) and higher number lambs weaned (1.15 ± 0.05) than Rambouillet (1.05 ± 0.05). There were more Rambouillet ewes (n = 26) present at 9 years of age than Dorper ewes (n = 12); survival curves correspondingly differed for the breeds (P < 0.05). A ewe breed × type of birth interaction was detected for lamb birth and weaning weight (P < 0.01); in each birth type category, lambs out of Rambouillet ewes were heavier than lambs out of Dorper ewes (P < 0.01). Birth weight was progressively lower for lambs as singles, twins, and triplets. Weaning weights of lambs born to Dorper ewes were progressively smaller for singles, twins, and triplets (P < 0.01); from Rambouillet ewes single lambs were heavier than other types (P < 0.01). Among twins, but no other birth type category, lambs raised by Dorper ewes were heavier than those raised by Rambouillet ewes (P < 0.01). Without respect to wool production, Dorper ewes appear to be a viable alternative breed to Rambouillet for West Texas production systems, with advantages in lambing interval, number born per litter, and weaning weight, but offset somewhat by lower longevity." @default.
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• W3004984670 date "2020-04-01" @default.
• W3004984670 modified "2023-10-18" @default.
• W3004984670 title "Comparative performance of Dorper and Rambouillet ewes on West Texas range" @default.
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• W3004984670 doi "https://doi.org/10.1016/j.smallrumres.2020.106065" @default.
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