Lamb livability in two closed flocks of local Rahmani and Barki sheep

Afifi, E. A.; Galal, E. S. E.; El-Kimary, I. S.

doi:10.1111/j.1439-0388.1984.tb00051.x

Cited by 2 publications

(2 citation statements)

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“…On an average, 1% increase in individual inbreeding coefficient should reduce the 0.31, 0.34, 0.32, 0.31, 0.33, 0.44 and 0.49 percent lamb survival up to the age of 15 day; 1, 2, 3, 6, 9 and 12 months, respectively. The effect of inbreeding on lamb survival at different ages has been the subject of several repots and reviews (Doney, 1957;Lax and Brown, 1967;Galal et al, 1981;Wiener et al, 1983;Afifi et al, 1984;Lamberson and Thomas, 1984;Ercanbrack and Knight, 1991) and regression coefficients varied considerably from -0.007 to -0.444. The regression coefficients estimates for lamb survival rate at different ages up to 1 year of age in the present study is well comparable to reported estimates of various workers in different sheep breeds.…”

Section: Resultsmentioning

confidence: 99%

Effects of Inbreeding on Lamb Survival in a Flock of Muzaffarnagari Sheep

Mandal¹,

Pant²,

Rout³

et al. 2004

Asian Australas. J. Anim. Sci

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A pedigree file of 4,628 records of Muzaffarnagari sheep, maintained at Central Institute for Research on Goats (CIRG), Makhdoom, was used to calculate the inbreeding coefficient of the flock. The flock had been closed for about 25 years (1978 to 2002). The investigation was aimed to study the effects of inbreeding on survivability of lambs. The cumulative survivability of lambs i.e., lambs survived up to 3, 7 and 15 days, 1, 2, 3, 6, 9 and 12 months after birth was considered for the study. The average level of inbreeding of lambs was 1.60%, ranging from 0 to 26.4%. The average inbreeding coefficient of dam over the periods was 1.00% and it ranged from 0 to 25.0%. Significant (p<0.05) adverse effect of lamb's inbreeding was observed on survivability of lambs at all ages except up to 3 and 7 days after birth. On an average, 1% increase in individual inbreeding coefficient should reduce the 0.31, 0.34, 0.32, 0.31, 0.33, 0.44 and 0.49 percent lamb survival up to the age of 15 day and 1, 2, 3, 6, 9 and 12 months, respectively. Ewes inbreeding had non-significant effects on lamb survival at all ages.

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Section: Resultsmentioning

confidence: 99%

Effects of Inbreeding on Lamb Survival in a Flock of Muzaffarnagari Sheep

Mandal¹,

Pant²,

Rout³

et al. 2004

Asian Australas. J. Anim. Sci

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“…Saidi sheep are sexually matured at one year of age (El -Hommisi and Abdel Hafiz, 1982;Galal, 2005). Their lambs have good livability under the intensive agriculture conditions of hot Upper Egypt (Galal et al, 1981;Afifi et al, 1984)…”

Section: Saidi Sheepmentioning

confidence: 99%

Review of Sheep and Goat Research and Development in Egypt Since the Forties: II-Phenotypic Characteristics, Production, and Reproduction Performance of Local Sheep Breeds

Aboul-Naga

Abdelsabour

2023

Journal of Animal and Poultry Production

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Egyptian local sheep breeds are widely spread over the country; raised mainly by smallholders and contribute significantly to their livelihood. Local breeds are well adapted to the prevailing hot dry conditions, and limited feed resources. They are fat-tailed sheep, open coarse wool and raised mainly for meat and lamb production. There are four major sheep breeds in Egypt; Rahmani sheep in north-Delta, Ossimi sheep in Mid-Egypt, Barki sheep in the Mediterranean coastal zone, and Saidi sheep in Upper Egypt. Minor local breeds are Fallahi, Wahati, Abudeleik, and Suhagi sheep located mainly in the south and in boarder governorates. Special and unique phenotypic characteristics are described for each breed. Production performance of the main local breeds include body weights, carcass quality, wool, and milk production, are tabulated as reported in the literature. Reproduction performance involving age at puberty, estrous, and breeding activity are discussed. Adaptability of local breeds to the prevailing subtropical environment, specially heat stress are presented. Key issues as the advantages of the local breeds, within the ongoing debate on breeding adapted law producing local animals, vs. high producing low tolerant exogenous breeds are discussed. Improvement programs for local sheep breeds requires sort of nucleus flock structure, as breeders association or village flocks, and the utilization of the recent findings of genomic analysis.

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Lamb livability in two closed flocks of local Rahmani and Barki sheep

Cited by 2 publications

References 10 publications

Effects of Inbreeding on Lamb Survival in a Flock of Muzaffarnagari Sheep

Effects of Inbreeding on Lamb Survival in a Flock of Muzaffarnagari Sheep

Review of Sheep and Goat Research and Development in Egypt Since the Forties: II-Phenotypic Characteristics, Production, and Reproduction Performance of Local Sheep Breeds

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