Genetic parameters of Barki sheep raised under semi-arid conditions

Fahmy, M. H.; Galal, E. S. E.; Ghanem, Y. S.; Khishin, S. S.

doi:10.1017/s0003356100027008

Cited by 14 publications

(8 citation statements)

References 8 publications

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“…The correlation coefficient between birth weight and pre-weaning average daily gain was 0-28 and highly significant <P<0-01). Shelton (1964) and Fahmy et al (1969) reported coefficients of 0-52 and -0-04, respectively, both of which differ considerably from that in the present study.…”

Section: Resultscontrasting

confidence: 99%

The relationships between pre- and post-weaning growth traits in lambs of Iranian fat-tailed sheep and their crosses with Corriedale and Targhee rams

Farid

Makarechian

1978

Anim. Sci.

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Link to this article: http://journals.cambridge.org/abstract_S000335610003960XHow to cite this article: A. Farid and M. Makarechian (1978). The relationships between pre-and postweaning growth traits in lambs of Iranian fat-tailed sheep and their crosses with ABSTRACT The pre-weaning records (birth weight, weaning weight and gain from birth to weaning) of 291 male and female lambs and the postweaning records (body weight, feedlot gain and food conversion) of 136 male lambs were used to study relationships between different traits. The lambs were derived from three fat-tailed Iranian sheep breeds (Karakul, Mehraban and Naeini) and their crosses with Corriedale and Targhee rams. All lambs were weaned at 75 + 5 days of age and the males were fed in a feedlot for 100 days after weaning. Feedlot measurements were taken at 20-day intervals. Weaning weight and pre-weaning average daily gain showed positive and significant associations with birth weight. Birth weight, weaning weight and gain from birth to weaning were positively associated with body weight at subsequent ages in feedlot as well as with final weight (P<0-01). Birth weight, weaning weight and pre-weaning average daily gain were positively and significantly associated with total feedlot gain. Of the different traits, total gain during the first 20 days in feedlot (adjust period) had the lowest and total gain during the second 20 days had the highest association with total feedlot daily gain. There was no evidence that the heavier lambs at weaning and those showing high growth rate before weaning, were more efficient in the feedlot. Gain during the second 20-day period in the feedlot had a significant negative association with the total food conversion (unit food/unit gain) and therefore was a good predictor for food conversion. When the feedlot period was divided into two 40-day periods, it was found that gain during both had a significant negative association with the corresponding food conversion. A similar association was observed between total feedlot gain and food conversion, indicating that the rate and efficiency of gain improved simultaneously.

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Section: Resultscontrasting

confidence: 99%

The relationships between pre- and post-weaning growth traits in lambs of Iranian fat-tailed sheep and their crosses with Corriedale and Targhee rams

Farid

Makarechian

1978

Anim. Sci.

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“…The correlation between 3-and 6-month weights was much higher and its magnitude suggests that in selection of animals for 6-month weight, some pre- liminary culling may be based on 3-month weight. The correlation estimates reported here are higher than those obtained by Fahmy et al (1969) for Barki sheep in Egypt but similar to the values obtained by Farid & Makarechian (1978) in Iranian fat-tailed sheep. Six-month weight of lambs is regarded as a good indicator of their genetic potential for future growth (Bradford & Spurlook, 1972) and i» therefore an important selection criterion in meat breeds of sheep.…”

Section: Relationships Between Lamb Weights At Different Agessupporting

confidence: 79%

Breed and environmental effects on lamb production in Nigeria

Buvanendran¹,

Adu²,

Oyejola³

1981

J. Agric. Sci.

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Two indigenous breeds of sheep in Nigeria, the Yankasa and Uda and crosses of these with exotic breeds, were evaluated for lamb weights at birth, 3 months and 6 months of age and for adult ewe weight. The cross-bred lambs were significantly (P < 0-05) heavier than the indigenous breeds at all ages. Differences among the indigenous breeds were not significant. Mature ewe weight was 40-8 kg in the cross-bred and 36-0 and 31-1 kg in the Uda and Yankasa respectively, differences between all breeds being significant (P<0-05). Lamb productivity (lamb weight per kg of ewe metabolic body weight) estimates demonstrated that the differences between breeds were small.Least-squares estimates of effects of environmental factors on lamb performance showed that type of birth and age of dam were important for lamb weights at the three ages. Season and sex also had significant effects on birth and 6-month weights respectively. Correction factors for lamb weights were derived from least-squares estimates.The correlation coefficient between birth and 3-month weight was significant in all breeds and ranged from 0-39 to 0-55. Three-month and 6-month weights were highly correlated with estimates of correlation coefficients ranging from 0-71 to 0-74. Repeatability estimates of birth, 3-month, 6-month and ewe weights, all as traits of the ewe in the Yankasa, were 0-25, 0-21, 0-09 and 0-48, respectively.

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“…The present estimates are lower than most of those reported in the literature which range from 0-34 to 0-78 (Morley, 1955;Young, Turner & Dolling, 1960&;Hall, Ruttle & Sidwell, 1964;Brown & Turner, 1968;Mullaney et al 1970;and others). For the local breeds, Fahmy et al (1969) and Kadry (1971) working on Barki and Karam (1959) working on Rahmani, reported higher estimates than the present ones (ranging from 0-29 to 0-55).…”

Section: Genetic Parameterscontrasting

confidence: 59%

“…In agreement with these findings, Young et al (1965), Brown & Turner (1968) and Burfening, Van Horn & Blackwell (1971) reported positive genetic correlations between yearling greasy fleece weight and each of weaning and 16-month body weights. On the other hand, some other reports showed low negative genetic correlation between yearling body weight and yearling greasy fleece weight (Morley, 1955;Hall et al 1964;and Fahmy et al 1969).…”

Section: Genetic Parametersmentioning

confidence: 94%

Environment and genetic factors affecting wool production from sub-tropical coarse wool sheep

Aboul-Naga

Afifi

1977

J. Agric. Sci.

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Wool production from different flocks of Ossimi, Rahmani and Barki Egyptian local sheep, raised at six different locations in the country was studied. Different genetic parameters for greasy fleece weight of the three breeds were estimated.Location was of significant effect on annual greasy fleece weight of Rahmani sheep only. With the adjustment for differences in yield percentages, differences in clean wool production from one location to another were slight for the three breeds. Age of ewe was of highly significant effect on annual greasy fleece weight.Heritability estimates of annual greasy fleece weight of the ewes were found to be generally low in the three breeds (range 0-00-0-34). The estimates differed markedly with age; those of the yearling fleece weight of Rahmani and Barki ewes were the highest, being 0-19 and 0-34, respectively.Repeatability estimates of annual greasy fleece weight were also low, being 0-11-0-04 and 0-29 for Ossimi, Rahmani and Barki ewes, respectively.Estimates of genetic correlation between yearling greasy fleece weight of the Ossimi and Rahmani ewes and their weaning and yearling body weights were high and positive. Those between annual greasy fleece weight of the ewes and their reproductive performance traits differed greatly in the two breeds.Delta (M. Moussa and Gemmiza locations, respectively), and the others in Middle and Upper Ossimi, Barki and Rahmani are sub-tropical fat-Egypt regions (Sids and Mallawi locations, restailed sheep. The first two breeds are white in pectively). Two Rahmani flocks were raised at M. colour with coloured faces, while the third breed Moussa and Serw locations, the latter located in the is of brown colour. The three breeds clip light north of Delta. Two Barki flocks were raised at M. fleeces of coarse wool type.Moussa location and in the coastal zone of the The present work reports on wool production Western Desert at B. Arab location. Management from different flocks of the three breeds when was kept as similar as possible, in the different raised at different locations in Egypt. Different flocks. The geographical representation of difgenetic parameters for annual greasy fleece weight ferent locations and the managerial procedures of the three breeds, and its genetic correlation were previously discussed by Aboul-Naga (1976a). with other performance traits were estimated.The annual greasy fleece weight of the ewes born from 1955-69 inclusively, up to their 7th MATERIALS AND METHODS y ear / f 3 ' wer fl e ™Juded m . * e ^ f**-records of their first fleece weight (shorn at 10 Data used in this study were those of different months of age) were analysed. Numbers of ewes flocks from the three breeds (Ossimi, Rahmani and available for the study were 1426, 1101 and 312 Barki) raised since 1955 at six different locations in from the Ossimi, Rahmani and Barki sheep, resEgypt, in farms belonging to the Ministry of Agri-pectively. The total number of the annual ewe culture. The Ossimi flocks were raised at four records was 7502, while that of the first (ye...

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Genetic parameters of Barki sheep raised under semi-arid conditions

Cited by 14 publications

References 8 publications

The relationships between pre- and post-weaning growth traits in lambs of Iranian fat-tailed sheep and their crosses with Corriedale and Targhee rams

The relationships between pre- and post-weaning growth traits in lambs of Iranian fat-tailed sheep and their crosses with Corriedale and Targhee rams

Breed and environmental effects on lamb production in Nigeria

Environment and genetic factors affecting wool production from sub-tropical coarse wool sheep

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