Effect of Body Weight of Ewes on Subsequent Lamb Production

Ray, E. E.; Smith, Stanley L.

doi:10.2527/jas1966.2541172x

Cited by 4 publications

(15 citation statements)

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“…These findings were similar to the results of Ray and Smith (14) and Aliyari et al (15). Those researchers reported that the increase in LWs of ewes resulted in parallel increase in the weaning weights of the lambs.…”

Section: Live Weights Of Lambssupporting

confidence: 83%

“…These values were 9% lower than the values reported by Ray and Smith (14) and 20% higher than the values reported by them for weaning weight. It was also found that a 1 kg increase in the LW of the WK sheep resulted in 6.4, 161, and 198 g increases in the BW and 60 and 120 day LWs of the lambs, respectively.…”

Section: Live Weights Of Lambscontrasting

confidence: 54%

“…It was also found that a 1 kg increase in the LW of the WK sheep resulted in 6.4, 161, and 198 g increases in the BW and 60 and 120 day LWs of the lambs, respectively. The increase in the rate of growth for the lambs as a result of the increase in LW in WK ewes was found to be 100 g higher than that reported by Ray and Smith (14). In this study, lambs that had BWs equal to 7.08% of the LW of the ewes (57.6 kg) were produced and this value was similar to that (6.5%-10.6%) found by Donald and Russell (21) for ewes with LWs of 100 kg.…”

Section: Live Weights Of Lambscontrasting

confidence: 49%

“…Effect of BCS and LW of ewes on weaning weight was significant (P < 0.05) and following ewes' weight increases, lambs' weaning weights increased. Ray and Smith (14) found that the heaviest ewes at mating produced lambs that weighed 9% and 20% more at birth and weaning, respectively, than ewes in the lightest weight group.…”

mentioning

confidence: 99%

“…effects of LW have greater impact than ewe's age on sheep reproduction efficiency (14,15). Body condition score (BCS) and LW of the ewes during the lambing period are important factors affecting their growth performance in the postnatal period (16).…”

mentioning

confidence: 99%

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Effect of live weight and age of Akkaraman ewes at mating on multiple birth rate, growth traits, and survival rate of lambs

Aktaş¹,

Doğan²

2014

Turk J Vet Anim Sci

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Section: Live Weights Of Lambssupporting

confidence: 83%

Section: Live Weights Of Lambscontrasting

confidence: 54%

Section: Live Weights Of Lambscontrasting

confidence: 49%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Effect of live weight and age of Akkaraman ewes at mating on multiple birth rate, growth traits, and survival rate of lambs

Aktaş¹,

Doğan²

2014

Turk J Vet Anim Sci

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Genetic (co)variance components for ratio of lamb weight to ewe metabolic weight as an indicator of ewe efficiency

et al. 2012

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Data from a multibreed commercial flock located at Mid-West of Brazil, supported by Programa de Melhoramento Genético de Caprinos e Ovinos de Corte (GENECOC), were used to estimate genetic parameters of traits related to ewe productivity by Average Information Restricted Maximum Likelihood method applied to an animal model. The analyzed traits were litter weight at birth (LWB) and at weaning (LWW), ewe weight at weaning (EW) and ewe production efficiency, estimated by WEE = LWW / EW 0.75 . The heritabilities were 0.26± 0.05, 0.32± 0.06, 0.37± 0.03 and 0.10± 0.02 for LWB, LWW, EW and WEE, respectively. Significant effects for direct heterosis were observed for LWW and EW. Recombination losses were important for EW and WEE. Genetic correlations of LWB with LWW, EW and WEE were 0.68, 0.37 and 0.15, respectively; of LWW with EW and WEE were 0.30 and 0.34, respectively; and between EW and WEE was −0.25. Even though it is a low heritability trait, WEE can be indicated as a selection criteria for improving the ewe productivity without increasing the mature weight of animals due to its genetic correlations with LWW and other traits.

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Environmental factors and genetic parameters of growth traits in Tunisian local sheep

Souf,

Saidani,

M’Hamdi

et al. 2024

Preprint

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This study aimed to evaluate the growth performance of lambs from four Tunisian sheep breeds. It involved 45780 lambs in 134 flocks from 99 farms. The zootechnical data (live weight, average daily gain) for the period 2011–2016 were obtained from the C of Genetic Improvement of the Office of Livestock and Pastures in Sidi Thabet. The results obtained showed a significant difference in weight and daily gains at typical ages. Lambs from single births were heavier than lambs from double births (1.05 ± 0.14 and 1 ± 0,01 kg). ADGs were influenced by the sex-mode of birth (P < 0.05). Single-born lambs showed higher ADGs, followed by twice-born lambs. The genetic type factor significantly influenced the growth of the lambs (P < 0.05). However, it should be noted that performance (weight growth and average daily gain) was better at the QFO breed. The age of the dams showed higher ADGs in lambs from dams aged 3 to 4 years, while the lowest ADGs were recorded in lambs from dams aged 5 years and older. The heritability coefficients of weights at different ages were estimated at 0.16 ± 0.04 for ADG3060 and 0.48 ± 0.03 for W10. The lowest values were observed for the ADG3060 (0.16 ± 0.021). The highest value is obtained for P10. Estimates of the genetic correlation for W10 with other parameters (W60, ADG0030, and ADG3060) were of the order of 14–42% of the variability.

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Effect of Body Weight of Ewes on Subsequent Lamb Production

Cited by 4 publications

References 0 publications

Effect of live weight and age of Akkaraman ewes at mating on multiple birth rate, growth traits, and survival rate of lambs

Effect of live weight and age of Akkaraman ewes at mating on multiple birth rate, growth traits, and survival rate of lambs

Genetic (co)variance components for ratio of lamb weight to ewe metabolic weight as an indicator of ewe efficiency

Environmental factors and genetic parameters of growth traits in Tunisian local sheep

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