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Ewe Fertility in the STAR Accelerated Lambing System - Conclusions

Abstract

Figure 2. Relationship of fertility to year and season of mating

Figure 3. Relationship of litter size to year and season of mating

Figure 4. Relationship of fertility to lambing number (numer of times a ewe has lambed)

Figure 6. Relationship of fertility to mating season

Conclusions

Comment

Ewe Fertility in the STAR Accelerated Lambing System

R. M. Lewis and D. R. Notter

Virginia Polytechnic Institute and State University

D. E. Hogue and B. H. Magee

Cornell University

Journal of Animal Science (1996) 74:1511-1522

Fertility and prolificacy in the STAR accelerated lambing system varied systematically among seasons during the year. Fertility was controlled by a complex interplay of effects of ewe age (expressed as lambing number), mating season, and time since last lambing. A matrix showing expected fertility levels was constructed and can be used to predict fertility for various types of ewes exposed in different seasons of the year. Values in the matrix can also be used to adjust fertility data and(or) form contemporary groups in programs for genetic evaluation of reproductive traits in accelerated lambing systems.

 

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