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Simeonov M.,Research Institute of Forage Crops | Todorov N.,Trakia University | Nedelkov K.,Trakia University | Kirilov A.,Research Institute of Forage Crops | Harmon D.L.,University of Kentucky
Small Ruminant Research | Year: 2014

The aim of the present study was to analyze live weight and growth data from birth to a live weight of 24-26. kg in early weaned lambs. The growth in the different age periods was determined on the basis of live weight changes for 152 lambs from the Blackhead Pleven breed. The results showed that the single lambs with a higher live weight at birth grew faster, but for twins there were no differences (P > 0.05). The difference in live weight was largely related to sex and type of birth. During the first 14 days of the suckling period the growth of lambs depended mainly on the amount of suckled milk. The male lambs grew faster than females after weaning. The lambs born as twins or singles placed under the same conditions of feeding and management did not differ in daily growth after weaning. Differences in live weight of lambs at birth and at weaning time were apparent until lambs reached 25. kg live weight. Correspondingly, this led to an increase of 5-10 days to reach 25. kg live weight of the lambs weaned at less than 9-11. kg and under 19-21 days, compared with the older lambs or born or lambs weaned at heavier live weights. The live weight from 7 to 11. kg and age from 17 to 28 days of weaning did not affect daily gain after weaning. However, all lambs have relatively low daily gain during the first week after weaning (about 50-60% of expected) and during the second week (about 60-70% of expected gain). © 2014 Elsevier B.V. Source


Simeonov M.,Research Institute of Forage Crops | Todorov N.,Trakia University | Nedelkov K.,Trakia University | Ribarski S.,Trakia University | And 4 more authors.
Emirates Journal of Food and Agriculture | Year: 2015

The objective of this study was to compare the growth rate, rumen development and some quality parameters of carcass and meat in lambs weaned at 25 and 70 days of age. The average live weight gain during experimental period was 268 g per day for suckling lambs and 233 g per day for lambs on dry feed. The difference of 13.1% in daily gain was not significant at P<0.05. The lambs weaned at 25 days of age showed tendency for higher dressing percentage and carcass weight, more separable internal fat, and better carcass fattiness (P>0.05), compared to those weaned at 70 days of age. Therefore it is possible to obtain approximately the same growth in live weight and carcass in lambs weaned at 25 and 70 days of age. The lambs weaned at 25 kg live weight had higher weight of internal organs than the lambs weaned at 70 days, but the difference was significant (P<0.05) only for lung liver, small intestine, thick intestine and rumen. The length and thickness of rumen papillae were higher in lambs weaned at 25 days of age compared to the lambs weaned at 70 days of age (P<0.05). Significantly thicker was the rumen wall in the lambs weaned at 25 days of age compared to the weaned at 70 days (P<0.05). Source

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