The effect of crossbreeding and other factors on livability of lambs raised under semi‐arid conditions

Galal, E. S. E.; Mabrouk, Mohamed M.; Ghanem, Y. S.; El-Oksh, H.A.

doi:10.1111/j.1439-0388.1974.tb01148.x

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Constants show that lambs born to 5-year old ewes experienced always higher survival rate than those born to ewes of either younger or older ages. In this respect, GALAL et al (1974) found that age of dam had no significant effects on lamb livability at 6,60 and 120 days of age. DICKERSON et al (1975) indicated that age ofdam effect, in this respect, was less pronounced at birth than at the age of 4 and 10 weeks with a more linear trend in the former ages but a curvilinear one in the latter.…”

Section: Least Squares Estimates Of Effects On Livability Of Lambs (Lmentioning

confidence: 80%

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

Afifi

Galal

El-Kimary

1984

Zeitschrift für Tierzüchtung und Züchtungsbiologie

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Section: Least Squares Estimates Of Effects On Livability Of Lambs (Lmentioning

confidence: 80%

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

Afifi

Galal

El-Kimary

1984

Zeitschrift für Tierzüchtung und Züchtungsbiologie

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Factors affecting lamb survival in crossbred sheep

Malik

Singh

Acharya

et al. 1980

Trop Anim Health Prod

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Survival from birth to 1 month, 1 month to weaning, weaning to 1 year and birth to 1 year was studied in crosses of native carpet wool breeds (Chokla, Malpura and Jaisalmeri) with Rambouillet. Least-squares analysis of data considering survival as 1 and mortality as 0, showed that the year and season of birth affected survival significantly during all age periods except from birth to 1 month and from 1 month to weaning where season had no significant effect. Sex (studied only for pre-weaning survival), ewe's weight at lambing and birth weight of lamb did not influence survival except that the ewe's weight a significant influence on survival from 1 month to weaning. Genetic groups did not differ significantly. Rambouillet X Malpura F1s had a higher survival rate than the other 2 F1s. There was a non-significant decline in survival with an increase in Rambouillet inheritance, except that 5/8 Rambouillet -3/8 Chola crossbreds had a slightly higher survival rate than Rambouillet X Chokla F1s. Interbreeding F1 and 3/4 crossbreds did not result in any significant decline in survival. The results show that the introduction of exotic fine-wool inheritance up to 50% and interbreeding of halfbreds will not result in any decline in survival.

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Lamb survival as affected by inbreeding and cross-breeding

et al. 1981

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Data representing 1928 lambing records were analysed to study the effects of inbreeding and cross-breeding on lamb survival to the ages of 7, 30, 120 and 180 days. The sheep flock consisted of two native breeds, Barki (B) and Rahmani (R); and the imported Fleisch Merino (M) as well as the crosses M x B and M x MB. Analysis was made by fitting a least-squares linear model that included the main effects of year and season of birth, sex, age of dam, type of birth, inbreeding of the lamb (F o ) and the dam (F d ) and breed group and the interactions season x type of birth, season x F o and season x breed group. Lambs were classified into six groups according to the magnitude of the inbreeding coefficient: F «£ 0-05, 0-05 < F «S 0-10, 0-10 < F s£ 0-15, 0-15 < F ^ 0-20, 0-20 < F s£ 0-25 and F > 0-25. The average inbreeding coefficient in the flock was 0-12 and 0-08 for the lambs and their dams, respectively.Sex of lamb and age of dam had no significant effect on lamb survival at any age while single-born lambs had a higher (P < 0-01 or P < 0-05) survival than twins at all ages except 7 days. Inbreeding of the lambs showed significant effect at 7 and 120 days.

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The effect of crossbreeding and other factors on livability of lambs raised under semi‐arid conditions

Cited by 3 publications

References 7 publications

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

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

Factors affecting lamb survival in crossbred sheep

Lamb survival as affected by inbreeding and cross-breeding

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