Growth and carcass composition of lambs of two breeds and their cross grazing ryegrass and clover swards

Jm, Macfarlane; Rm, Lewis; Gc, Emmans

doi:10.1017/s1357729800090251

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…The same authors reported significant differences for HCY and CCY. Likewise, other authors have reported differences among sheep breeds with distinct aptitudes for HCW and CCW (Macfarlane et al, 2004;Kashan et al, 2005;Ekiz et al, 2009). In the case of HCY and CCY, studies have found differences among breeds (Kremer et al, 2004;Rodrigues et al, 2006;Ekiz et al, 2009).…”

Section: Breed Effectmentioning

confidence: 75%

Effect of breed and feeding on the carcass characteristics of the Chilote breed lamb

Ramírez-Retamal

Morales

Martínez

et al. 2013

Chilean J. Agric. Res.

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The Chilote sheep has been developed in an isolated environment, based on grazing lands with low nutritive value belonging to small-scale producers, because of which there is little information about the use of this breed for meat production. The objective of this work was to determine the effects on lamb carcasses of two breeds with different productive purposes and fed on pastures with different nutritional quality. Three groups of lambs were used. The first and second groups were composed of 13 and 11 Chilote lambs respectively, and the third composed of six Suffolk Down lambs. Lambs remained with their mothers, the first group on naturalized pasture and the rest on rangeland. Animals were slaughtered at 90 d of age. Live weight, carcass weight and yield, and several zoometric parameters were determined, as well as the weight of commercial cuts and the muscle, bone and fat ratios. Hide and hoof weights were also measured. For the effect of breed, Chilote lamb is narrower (P ≤ 0.05) than Suffolk Down, but with a higher proportion of hide (P ≤ 0.05) and hooves (P ≤ 0.05). The type of pasture only affected hot carcass yield, which was higher in Chilote lamb with naturalized pasture than with rangeland (P ≤ 0.05). There were no effects of breed or pasture type on the main characteristics of the lamb carcasses.

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Section: Breed Effectmentioning

confidence: 75%

Effect of breed and feeding on the carcass characteristics of the Chilote breed lamb

Ramírez-Retamal

Morales

Martínez

et al. 2013

Chilean J. Agric. Res.

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“…It has been found that superior genotypes can express their superiority only to an extent that is set by the quality of the environment ; Macfarlane et al, 2004). The genetic difference in growth rate was found to decrease steadily as the environment worsened, both between selection lines and between breeds (Macfarlane et al, 2004). Similarly, differences in husbandry between purebred and commercial farms may play a role.…”

Section: Sire Index and Breed Influencesmentioning

confidence: 93%

Index selection in terminal sires improves early lamb growth1

Márquez

Haresign

Davies

et al. 2012

Journal of Animal Science

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ABSTRACT:The use of terminal sires (TS) for crossbreeding is integral to the UK sheep industry where approximately 71% of market lambs are sired by TS rams. Early growth of these crossbred lambs affects profitability. The objectives of this study were i) to evaluate the effectiveness of index selection among TS on BW and ADG of their crossbred offspring; and ii) to compare the efficacy of that selection within TS breeds. The most widely used TS breeds in the United Kingdom are Charollais, Suffolk, and Texel. These participated in sire referencing schemes in which they were evaluated on a lean growth index designed to increase carcass lean weight at a given age. From 1999 to 2002, approximately 15 high and 15 low lean growth index rams per breed (93 in total, differing in index on average by 4.6 SD) were selected from within their sire referencing schemes and mated to Welsh and Scottish Mule ewes. Their crossbred offspring were reared commercially on 3 experimental farms in England, Scotland, and Wales. A total of 6,515 lambs were born between 2000 and 2003. Lambs were weighed at birth (BWT), 5 wk (5WT), and 10 wk (10WT), and their ADG from birth to 10 wk was calculated. Lambs sired by high index rams were on average, across breeds, heavier at all ages (P < 0.01) with 0.07 ± 0.03, 0.3 ± 0.1, and 0.4 ± 0.1 kg greater BWT, 5WT, and 10WT, respectively. Their ADG was 5.1 ± 1.9 g/d greater than low-index-sired lambs (P < 0.01). Suffolk-sired lambs were on average heavier at all ages, with greater ADG, whereas Charollais-sired lambs were lightest with smallest ADG. Overall, there was no significant interaction between sire index and sire breed (P > 0.10). Within Suffolk-sired lambs, there was little difference between high and low index sires for the traits studied (P > 0.3). High and low index Charollais-sired lambs differed in BWT (0.09 ± 0.04 kg) and 5WT (0.3 ± 0.1 kg), and Texel-sired lambs differed in 5WT (0.5 ± 0.1 kg), 10WT (0.9 ± 0.2 kg), and ADG (10.2 ± 3.3 g/d; P < 0.01). Lambs from Scottish Mule dams were heavier, with greater ADG, than lambs born to Welsh Mules (P < 0.01). Lambs reared in Scotland were heavier at all ages (P < 0.01). The results suggest that using index selection in TS can improve the growth of their commercial offspring reared on grass.

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“…Although the breeds and crossbreeds used in the study by Speijers et al (2009) were perhaps more associated with hill farming environments, the results demonstrated clear differences between three different diets and between the different breeds used. Macfarlane et al (2004) observed significant differences in the growth responses of lambs grazing different sward types, which, along with the results of Speijers et al (2009), demonstrate that differences in the magnitude of genetic superiority can exist between animals on different grazing types.…”

Section: Discussionmentioning

confidence: 54%

“…The increased level of detail gained in the present study was predominantly related to grazing management throughout the season, as well as the provision of supplementary feeding, vitamins and minerals. Studies by both Macfarlane et al (2004) and Speijers et al (2009) demonstrated significant results when breed by feed type interactions were examined. Although the breeds and crossbreeds used in the study by Speijers et al (2009) were perhaps more associated with hill farming environments, the results demonstrated clear differences between three different diets and between the different breeds used.…”

Section: Discussionmentioning

confidence: 98%

“…More recently, the effects of different planes of nutrition, as well as different geographical areas, have demonstrated G × E effects (both between and within breeds), in terms of their effects on lamb growth (Osoro et al, 1999;Steinheim et al, 2004 and and carcass characteristics, (Bishop et al, 1996;Lewis et al, 2004;Macfarlane et al, 2004). The effects of different nutrition levels on Merino wool production and quality traits have also identified G × E (Dominik et al, 1999), whereas environments based on flock milk yield were used by Sanna et al (2002) to identify G × E for milk yield in Sardinian Sarda sheep.…”

Section: Discussionmentioning

confidence: 99%

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Characterisation of terminal sire sheep farm systems, based on a range of environmental factors: a case study in the context of genotype by environment interactions using Charollais lambs

McLaren

Lambe

Morgan-Davies

et al. 2014

Animal

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The objective of this study was to define different terminal sire flock environments, based on a range of environmental factors, and then investigate the presence of genotype by environment interactions (G × E) between the environments identified. Data from 79 different terminal sire flocks (40 Texel, 21 Charollais and 18 Suffolk), were analysed using principal coordinate and non-hierarchical cluster analyses, the results of which identified three distinct environmental cluster groups. The type of grazing, climatic conditions and the use of vitamins and mineral supplements were found to be the most important factors in the clustering of flocks. The presence of G × E was then investigated using data from the Charollais flocks only. Performance data were collected for 12 181 lambs, between 1990 and 2010, sired by 515 different sires. Fifty six of the sires had offspring in at least two of the three different cluster groups and pedigree information was available for a total of 161 431 animals. Traits studied were the 21-week old weight (21WT), ultrasound muscle depth (UMD) and log transformed backfat depth (LogUFD). Heritabilities estimated for each cluster, for each trait, ranged from 0.32 to 0.45. Genetic correlations estimated between Cluster 1 and Cluster 2 were all found to be significantly lower than unity, indicating the presence of G × E. They were 0.31 (±0.17), 0.68 (±0.14) and 0.18 (±0.21) for 21WT, UMD and LogUFD, respectively. Evidence of sires re-ranking across clusters was also observed. Providing a suitable strategy can be identified, there is potential for the optimisation of future breeding programmes, by taking into account the G × E observed. This would enable farmers to identify and select animals with an increased knowledge as to how they will perform in their specific farm environment thus reducing any unexpected differences in performance.

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Growth and carcass composition of lambs of two breeds and their cross grazing ryegrass and clover swards

Abstract: Abstract

Cited by 7 publications

References 19 publications

Effect of breed and feeding on the carcass characteristics of the Chilote breed lamb

Effect of breed and feeding on the carcass characteristics of the Chilote breed lamb

Index selection in terminal sires improves early lamb growth1

Characterisation of terminal sire sheep farm systems, based on a range of environmental factors: a case study in the context of genotype by environment interactions using Charollais lambs

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