A comparison between 15 ram breeds for export lamb production 1. Liveweights, body components, carcass measurements, and composition

Abstract

Results on the body and carcass composition of 7885 lambs sired by 371 rams of 15 different breeds mated to Romney cast-for-age ewes are given. Trials were run at the Ruakura Agricultural Centre and the Manutuke Research Station from 1963 to 1972. Lambs of the different breeds were slaughtered at the same average age so that differences between breeds/crosses in liveweight and carcass weight reflected differences in growth rate. Ranked from heaviest to lightest mean age-adjusted carcass weights, lambs sired by the Dorset Horn, Poll Dorset, Hampshire, Border Leicester, Suffolk, Dorset Down, South Suffolk, and South Dorset Down produced the heaviest carcasses, and those sired by the Cheviot, Southdown, English Leicester, and Ryeland were intermediate. The Lincoln, Merino, and Romney sired carcasses were lighter. The longer-woolled Romney, Merino, and Lincoln had lowest dressingout percentages based on full liveweights and the short finer-wooled breeds such as the Southdown, Dorset Down, and Poll Dorset/Dorset Horn dressed 2-3% higher. When compared at the same carcass weight, lambs sired by the Southdown followed by the Ryeland had the fattest carcasses and those A94091Received 26 September 1994; accepted 27 April 1995 1 Deceased sired by the Suffolk, Cheviot, and Dorset Horn produced the least fat, leanest carcasses. The Southdown, Dorset Horn, South Dorset Down, and Poll Dorset crosses had the largest eye muscle areas for carcasses of similar weight.

Rendimento, composição tecidual e musculosidade da carcaça de cordeiros Santa Inês alimentados com diferentes níveis de feno de flor-de-seda na dieta

“…Os valores obtidos para AOL neste experimento (9,79 a 11,99 cm 2 ) foram próximos aos obtidos por Osório et al (1999), Kirton et al (1995) e Neres et al (2001) em cordeiros de diferentes raças. Esses autores obtiveram valores de 11,99; 9,5 e 10,84 cm 2 , respectivamente, superiores aos encontrados por Gonzaga et al (2006) e Pinto (2003, que, estudando cordeiros deslanados Morada Nova e Santa Inês em confinamento alimentados com diferentes volumosos, obtiveram valores para AOL de 4,71 a 7,89 cm 2 e de 6,52 a 8,10 cm 2 , respectivamente.…”

Breed and maturity effects on Churra Galega Bragançana and Suffolk lamb carcass characteristics: Killing-out proportion and composition

“…However, the cited authors found that breed had an effect on kidney and pelvic fat deposition in agreement with our results. But Kirton, Bennett, Dobbie, Mercer, and Duganzich (1995) and Kirton, Carter, et al (1995) registered significant differences between breeds in studies involving about 15 different breeds. According to our results, Teixeira et al (1996) found differences between CGB, Suffolk and Merino breeds for subcutaneous fat and KKCF percentages, however no significant differences were found for the intermuscular and total fat percentages.…”

Evaluation of the growth performance and carcass characteristics of lambs produced in Quebec

“…For both sexes, lambs from DP sires had a higher dressing percentage, a greater GR measurement, and poorer carcass lean, and saleable meat yields compared to lambs from HA or SU sires. Similarly, Wolfe (1980) and Kirton et al (1995) found that DP crossed lambs had heavier and fatter carcasses compared to SU crossed lambs. Also, SU lambs had leaner carcasses and a lower dressing percentage compared to RV or RVXSU lambs (Aziz 1992).…”