Influence of Breed of Sire on the Production of Light and Heavy Market Lambs

Fahmy, M. H.; Bernard, C.; Lemay, J. P.; Nadeau, Marie

doi:10.4141/cjas72-028

Cited by 13 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lack of breed-of-ram effects on ewe fertility and prolifi cacy in this study is generally consistent with data from studies comparing dual-purpose or terminal-type ram breeds mated in the autumn (Bradford et al, 1960;Fahmy et al, 1972;Carter and Kirton, 1975;Hohenboken et al, 1976;Freking et al, 2000;Speijers et al, 2010). Ewe fertility and prolifi cacy did not differ among Columbia, Suffolk, and Texel rams in studies reported by Latif and Owen (1979), Leymaster and Smith (1981), Leymaster and Jenkins (1993), and Ali et al (2005).…”

Section: Discussionsupporting

confidence: 90%

“…This study was conducted, in part, because of concerns regarding poor survival of Suffolk-sired crossbred lambs (Bradford et al, 1960;Fahmy et al, 1972;Carter and Kirton, 1975;Smith, 1977). Few studies have directly compared the terminal sire breeds evaluated herein, and no studies have assessed the relative survival of Composite-sired crossbred lambs.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Columbia, USMARC-Composite, Suffolk, and Texel rams as terminal sires in an extensive rangeland production system: I. Ewe productivity and crossbred lamb survival and preweaning growth1,2

Leeds¹,

Notter

Leymaster

et al. 2012

Journal of Animal Science

View full text Add to dashboard Cite

A 3-yr study was conducted to comprehensively evaluate Columbia, Suffolk, USMARC-Composite (Composite), and Texel breeds as terminal sires in an extensive rangeland production system. The objective was to estimate breed-of-ram effects on ewe fertility, prolificacy, and dystocia, and sire breed effects on lamb survival and growth until weaning at approximately 132 d of age. Data were from 22 Columbia, 22 Composite, 21 Suffolk, and 17 Texel rams with 957 exposures to 574 adult Rambouillet ewes (3- to 7-yr-old at lambing), 908 lambings, and 1,834 lambs. Ram breed did not affect ewe fertility (mean = 94.9%; p = 0.73), total number born per ewe lambing (mean = 2.02 lambs; p = 0.20), number born alive per ewe lambing (mean = 1.90 lambs; p = 0.24), or number weaned per ewe lambing (mean = 1.45 lambs, p = 0.94). Dystocia rates were different (p = 0.01) for ewes mated to Columbia (12.2%), Composite (13.5%), Suffolk (25.7%), and Texel rams (31.9%) during 1 yr of the study, but differences among ram breeds were not repeatable (p ≥ 0.38) during the other 2 yr. Suffolk-sired lambs were heavier (p ≥ 0.02) at birth (5.5 kg) and weaning (40.3 kg) than lambs sired by the other breeds, which did not differ (p ≥ 0.34) for birth weight (mean = 5.3 kg). Texel-sired lambs (37.4 kg) were lighter (p ≥ 0.02) at weaning than Columbia- (38.8 kg) and Composite-sired (38.4 kg) lambs, which did not differ (p = 0.40) for weaning weight. Sire breed effect approached significance (p = 0.06) for lamb survival to weaning; estimated survival probabilities were 0.87 (Columbia), 0.89 (Composite), 0.93 (Suffolk), and 0.86 (Texel) for lambs reared by their birth dam. Interaction between sire breeds and birth weight affected (p < 0.001) lamb survival and revealed that lightweight Columbia- and Suffolk-sired lambs had a greater risk of death than lightweight lambs sired by Composite and Texel rams, but risk of death did not increase substantially for heavyweight lambs from any of the breeds. When mated to adult Rambouillet ewes in an extensive rangeland production system, the use of Suffolk rams is warranted to improve preweaning growth of market lambs and is not predicted to affect ewe fertility, ewe prolificacy, dystocia, or lamb survival compared with the other sire breeds we tested.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Evaluation of Columbia, USMARC-Composite, Suffolk, and Texel rams as terminal sires in an extensive rangeland production system: I. Ewe productivity and crossbred lamb survival and preweaning growth1,2

Leeds¹,

Notter

Leymaster

et al. 2012

Journal of Animal Science

View full text Add to dashboard Cite

show abstract

“…All trials included contained far fewer comparisons than the present trial and ranked the Texel as leanest with the large mature-sized breeds such as the Suffolk and Oxford being leaner when compared on an equal liveweight/carcass weight basis with the smaller mature-sized breeds such as the Southdown and Clun. Fahmy et al (1972) showed that lambs sired by New Zealand Southdowns compared well with Suffolk-sired lambs for leanness, with American-type Southdowns producing lambs that had more fat and less lean than the New Zealand Southdowns. For the loin, the Suffolk cross lambs contained least fat, but most bone.…”

Section: Discussionmentioning

confidence: 99%

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

Kirton

Carter

Clarke

et al. 1995

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

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.

show abstract

“…Given that breeds have certain genetic limitations regarding growth and production traits (Brand and Franck, 2000), feedlotters may opt to use crossbred animals and so combine desirable traits from two parental breeds in order to increase their production output. Crossbred lambs are more likely to ensure economic success in a feedlot (Duddy et al, 2016), while it is commonly accepted that crossbreeding can improve lamb production (Cloete et al, 2008(Cloete et al, , 2007Fahmy et al, 1972;Sidwell and Miller, 1962). Malhado et al (2009) believed that crossbreeding could be used to meet speci c market needs.…”

Section: Introductionmentioning

confidence: 99%

Modelling and predicting fat deposition rates in various South African sheep crosses using ultrasound technology

Theron

Brand²,

Cloete

et al. 2023

Preprint

View full text Add to dashboard Cite

Producers require an accurate predictive tool that can determine the optimal point of slaughter based on fat depth. The modelling of fat deposition with a simple mathematical model could supply in this need. Dohne Merino and Merino ewes were crossed with Dorper, Dormer and Ile de France rams and the crossbred offspring reared under optimal growth circumstances until one year of age. Fat deposition of lambs of both sexes were monitored from 80–360 days using ultrasound and the data subsequently fitted to various equations and evaluated for goodness of fit. A linear fitting of fat depth to age (R2 > 0.77) and live weight (R2 > 0.56) were deemed to provide the best fit. The slope parameters of the equations indicated that ewes deposited fat faster than rams and that Dorper crosses had the highest fat deposition rate. An attempt was also made to model loin muscle growth, but the model fit was adjudged to be unsatisfactory.

show abstract

Influence of Breed of Sire on the Production of Light and Heavy Market Lambs

Abstract: For personal use only.

Cited by 13 publications

References 6 publications

Evaluation of Columbia, USMARC-Composite, Suffolk, and Texel rams as terminal sires in an extensive rangeland production system: I. Ewe productivity and crossbred lamb survival and preweaning growth1,2

Evaluation of Columbia, USMARC-Composite, Suffolk, and Texel rams as terminal sires in an extensive rangeland production system: I. Ewe productivity and crossbred lamb survival and preweaning growth1,2

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

Modelling and predicting fat deposition rates in various South African sheep crosses using ultrasound technology

Contact Info

Product

Resources

About