Tissue growth and development in crossbred lambs sired by ten breeds

Kempster, A. J.; Croston, D.; Jones, David

doi:10.1016/0301-6226(87)90016-9

Cited by 27 publications

(14 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This tendency was also noted in lambs of other sheep breeds showing that bones have earlier growth in comparison with muscles and fat (Kemster et al, 1987b;Papadimitriou et al, 1989;Taylor et al, 1989;Tzalis et al, 1994). This phenomenon can be explained by a change in the priority of the blood nutrient use by the body tissues of animals during the different stages of their life.…”

Section: Resultsmentioning

confidence: 76%

Effect of age at slaughter on carcass characteristics and carcass composition in lambs of mountain Greek breeds

Skapetas¹,

Sinapis²,

Hatziminaouglou³

et al. 2006

Czech J. Anim. Sci.

View full text Add to dashboard Cite

Forty male lambs of the mountain Greek breed were used to evaluate the effect of age at slaughter on carcass characteristics and composition. The slaughter of lambs was carried out at the age of 30, 45, 60, 75 and 90 days. The slaughter procedure, carcass dissection and carcass composition were realized according to the standard method of CIHEAM-AGRIMED programme. The results of this work showed that the lambs of different age groups did not differ in dressing percentage significantly. The proportion of muscles showed a tendency of increase with the increasing slaughter age but the differences were not significant. The proportion of total fat in carcass increased with the increasing slaughter age from 20.84 to 23.59% for the age group of 30 and 90 days, respectively (P < 0.05). On the contrary, as the age at slaughter increased, the proportion of bones decreased (P < 0.05). Subcutaneous, intermuscular, perinephric and pelvic fats increased with the slaughter age, but only the subcutaneous fat was influenced significantly (P < 0.05). Among the different commercial cuts proportions of long leg, first 5 ribs and shoulder decreased, while those of last 8 ribs-loin and breast-flank increased (P < 0.05). The overall results suggest that the slaughter age of lambs of the mountain Greek breed should be increased from the present ~45 days to more advanced age of 75 or 90 days in order to improve the farmers' profits without serious negative effects on the quality of carcasses or meat of lambs.

show abstract

Section: Resultsmentioning

confidence: 76%

Effect of age at slaughter on carcass characteristics and carcass composition in lambs of mountain Greek breeds

Skapetas¹,

Sinapis²,

Hatziminaouglou³

et al. 2006

Czech J. Anim. Sci.

View full text Add to dashboard Cite

show abstract

“…In this regard, Butler-Hogg (1984), Fourie et al (1970), Jones (1982) and Kempster et al (1987) reported allometric growth coefficients for IMF relative to SCF of 0.5 to 0.75 for the carcass in general, indicating that SCF is much later maturing than IMF. For individual cuts, Kempster et al (1987) Considering the ratios of IMF to SCF for fat score 2 in Table 7 and the results of Kempster et al (1987) and Palsson & Verges (1952) for the shoulder, loin and leg, the high increase in SCF in the loin towards higher fat scores in the present trial will be accompanied by a large increase in IMF as well. The shoulder will follow more or less the same trend and the IMF may increase to 50% of the SCF (Palsson & Verges, 1952).…”

Section: The South African Journal Of Animalmentioning

confidence: 94%

“…The shoulder will follow more or less the same trend and the IMF may increase to 50% of the SCF (Palsson & Verges, 1952). The only cut fit for trimming at high fat scores seems to be the leg as most of the fat is deposited in the SCF depot (Table 7) and the relative increase in SCF should be much higher than that of Kempster et al (1987). Palsson & Verges (1952) also reported that IMF of the leg was 20% of the total fat at 41 weeks in lambs on a high feeding plane.…”

Section: The South African Journal Of Animalmentioning

confidence: 99%

The influence of fat score and fat trimming on primal cut composition of South African lamb

Strydom¹,

Heerden²,

Schönfeldt³

et al. 2009

SA J. An. Sci.

View full text Add to dashboard Cite

________________________________________________________________________________ AbstractThe objectives of this study were to evaluate the primal cut composition of South African lamb carcasses with different fat scores, and to identify cuts suitable for fat trimming. Sixty grain fed Dorper lambs (rams and ewes) were divided into three groups and slaughtered at 30, 36 and 42 kg. Chilled carcass sides were subdivided into seven primal cuts. The cuts were dissected into meat (muscle, intermuscular and intramuscular fat), bone and subcutaneous fat (SCF) in order to determine the physical composition per cut and for the whole carcass. The % subcutaneous fat (SCF) in the loin increased the most (26 units) as the fat score increased from 1 to 5, followed by the flank, shoulder and neck. The % meat (lean) of the neck, thick rib and breast showed no significant change between fat scores 1 to 5, while % bone decreased significantly (>6% units). Meat and bone proportions decreased significantly with an increase in fat score for the loin, flank, leg and shoulder. The composition of the loin cut was most affected overall by changes in the fat score. Since different cuts accumulate SCF at different rates during fattening, trimming of SCF could reduce the boneless % SCF level of the major cuts such as the loin, leg and shoulder by 12, 6 and 9 units, respectively, when trimmed from SCF equal to a fat score 5 to a fat score 3. Further trimming to levels equal to a fat score 1, could reduce the % SCF by 18, 8 and 5 units, respectively on a boneless level. Considering differences in relative increase in intermuscular fat (IMF) and SCF in different cuts, the leg seems to be the most suitable cut for trimming in fat carcasses, since the IMF : SCF ratio is the lowest compared to the other larger cuts namely the loin and shoulder.________________________________________________________________________________

show abstract

“…Kempster et al (1987) reported that there were small differences between sire breeds, including Texel, in visually assessed carcass conformation. However, the current study shows a clear improvement in conformation, using the EUROP classification system, when Blackface ewes were crossed with Texel sires.…”

Section: Table 10mentioning

confidence: 99%

Effects of genotype and plane of nutrition on growth and carcass characteristics of lambs from hill sheep systems

Speijers

Carson

Dawson

et al. 2009

Animal

View full text Add to dashboard Cite

The objective of this study was to determine the effect of lamb genotype and plane of nutrition on post-weaning lamb growth, and carcass characteristics in hill sheep systems. The lamb genotypes compared were as follows: purebred Scottish Blackface, Swaledale 3 Scottish Blackface, Cheviot 3 Scottish Blackface, Lleyn 3 Scottish Blackface and Texel 3 Scottish Blackface lambs. During the finishing period, lambs were allocated to a (i) low plane of nutrition (LP), based on a fixed allowance of dried grass pellets representing a grass-based system; (ii) high plane of nutrition (HP-cereal), with a diet consisting proportionately of 0.20 dried grass pellets : 0.80 cereal-based concentrate offered ad libitum; (iii) high plane of nutrition (HP-cereal/oil), with a diet consisting proportionately of 0.20 dried grass pellets : 0.80 cereal-based concentrate containing oilseed rape offered ad libitum. There were significant genotype 3 diet interactions for dry matter (DM) intake ( P , 0.001), live weight gain ( P , 0.05) and carcass gain ( P , 0.05). On the LP diet, carcass gains were higher for Texel cross compared to Blackface and Swaledale cross lambs ( P , 0.05). On both HP diets, carcass gains were lower in Blackface and Swaledale crosses compared with the Cheviot, Lleyn and Texel cross lambs ( P , 0.01). Feed conversion efficiency, expressed in terms of carcass gain per unit of DM, was highest for Texel cross and Cheviot cross, lowest in Swaledale cross and Blackface and intermediate for Lleyn cross lambs ( P , 0.001). Conformation classification was lowest for Swaledale cross ( P , 0.05) and highest for Texel cross lambs ( P , 0.001), whilst those of Blackface, Cheviot and Lleyn cross lambs were similar. Carcasses from Blackface and Lleyn cross lambs had higher fat classifications than Texel and Cheviot cross lambs ( P , 0.01). Feed conversion efficiency was lowest with the LP diet compared with the HP diets, resulting in a 5-week longer finishing period and lower carcass weights, fat scores, dressing proportions and subcutaneous fat depth measurements. These results indicate that crossbreeding can have a major effect on lamb performance in the hill sheep sector. Feeding a HP increased lamb growth rates, particularly for high growthpotential genotypes, improved feed efficiency, shortened the finishing period but increased carcass fatness. Including oilseed rape in concentrate-based diets did not affect performance.

show abstract

Tissue growth and development in crossbred lambs sired by ten breeds

Cited by 27 publications

References 14 publications

Effect of age at slaughter on carcass characteristics and carcass composition in lambs of mountain Greek breeds

Effect of age at slaughter on carcass characteristics and carcass composition in lambs of mountain Greek breeds

The influence of fat score and fat trimming on primal cut composition of South African lamb

Effects of genotype and plane of nutrition on growth and carcass characteristics of lambs from hill sheep systems

Contact Info

Product

Resources

About