Effects of alternative lamb production systems, maternal line, and culling strategy on flock age structure
Article Abstract:
The effects of annual or accelerated lambing, 1/2 or 1/4 Finnsheep (Finn) lineage and various culling strategies on flock age structure, replacement requirements and productivity were evaluated. In all combinations, animals less than three years made up majority of the flocks. Replacement requirements for annual systems were relatively stable, while those for accelerated systems increased with intensive culling. Productivity was greatest with annual systems regardless of lineage. The interplay between variables rather than a single factor was thought to produce these effects.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Survival and cumulative lamb and wool production over 4 years
Article Abstract:
Cumulative production of female offspring of Polypay (P), Coopworth (C) and Suffolk (S) rams were measured from 1987 to 1990. Results showed that P-sired ewes produced the largest litter while S-sired ewes bred the heaviest lambs. On the other hand, C-sired ewes produced the most wool. Integrating ewe productivity into a single measure revealed that the range of gross productivity for the different breeds is less than 2%. It was also shown that the effect of some genes, such as wool production, is influenced by breed of the parental source of the trait.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Reproduction and lamb production
Article Abstract:
Coopworth (C), Polypay (P), Suffolk (S) crossbred ewes' reproductive and lamb production faculties were evaluated. P-sired ewes were slightly better in fertility, lamb survival and litter size than the other breeds. On the other hand, S-sired ewes had the heaviest birth and weaning lambs. C-sired ewes had less productivity compared to the other breeds. It was also established that birth weight of lambs was influenced by dam age and breed, but that their survival was not significantly affected by the maternal genotype.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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