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The Influence of Region, Production Level and Flock Size on Lamb Weight Adjustments in the Swedish Sheep Recording Scheme

The Influence of Region, Production Level and Flock Size on Lamb Weight Adjustments in the... Abstract The aim of this study was to determine whether adjustment factors for lamb weight (covering ewe age, litter size, sex and lamb age) should be different for different types of flocks. The appropriateness of using common adjustment factors for all flocks was studied with respect to interaction between the adjusted effects and with region, flock size and production level. The survey was based on data from the Swedish Sheep Recording Scheme from the years 1981–83, comprising the main breed groups Swedish Peltsheep (P), Swedish Landrace (L), Swedish Crossbred (X), the imported heavy breeds (K) and some minor breeds Swedish Finewool (Lf), Swedish Rya (Lr) and Swedish Crossbreds with crossbred parents (X*X). Interactions with region revealed that ram lambs (P, L, X) and lambs born to one-year old ewes (P and X) were in general given slightly too high adjusted weights in the northern part of Sweden. K-Group ram lambs tended to be slightly favoured in the western region. The adjustment factors were appropriate in the average flock size, while lambs after one-year old ewes and ram lambs were in most cases given slightly too high adjusted weights in small flocks. In Peltsheep the adjusted weights for triplets were significantly too high in large flocks. Significant interaction effects were found predominantly between production level and ewe age and between production level and sex which resulted in too high adjusted weights for lambs after both one- and two-year old ewes and for ram lambs in flocks with high production level. Interaction effects in the Lf-, Lr- and X*X-breeds were seldom observed and did not deviate from their respective breed groups. The results of this study do not motivate special sets of adjustments which consider region, flock size and production level. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Agri Scand A Animal Sci Taylor & Francis

The Influence of Region, Production Level and Flock Size on Lamb Weight Adjustments in the Swedish Sheep Recording Scheme

Kurowska, Z.; Danell, Ö.
Acta Agri Scand A Animal Sci , Volume 42 (2): 8 – May 1, 1992
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The Influence of Region, Production Level and Flock Size on Lamb Weight Adjustments in the Swedish Sheep Recording Scheme

Abstract

Abstract The aim of this study was to determine whether adjustment factors for lamb weight (covering ewe age, litter size, sex and lamb age) should be different for different types of flocks. The appropriateness of using common adjustment factors for all flocks was studied with respect to interaction between the adjusted effects and with region, flock size and production level. The survey was based on data from the Swedish Sheep Recording Scheme from the years 1981–83, comprising the...
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Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1651-1972
eISSN
0906-4702
DOI
10.1080/09064709209410114
Publisher site
See Article on Publisher Site

Abstract

Abstract The aim of this study was to determine whether adjustment factors for lamb weight (covering ewe age, litter size, sex and lamb age) should be different for different types of flocks. The appropriateness of using common adjustment factors for all flocks was studied with respect to interaction between the adjusted effects and with region, flock size and production level. The survey was based on data from the Swedish Sheep Recording Scheme from the years 1981–83, comprising the main breed groups Swedish Peltsheep (P), Swedish Landrace (L), Swedish Crossbred (X), the imported heavy breeds (K) and some minor breeds Swedish Finewool (Lf), Swedish Rya (Lr) and Swedish Crossbreds with crossbred parents (X*X). Interactions with region revealed that ram lambs (P, L, X) and lambs born to one-year old ewes (P and X) were in general given slightly too high adjusted weights in the northern part of Sweden. K-Group ram lambs tended to be slightly favoured in the western region. The adjustment factors were appropriate in the average flock size, while lambs after one-year old ewes and ram lambs were in most cases given slightly too high adjusted weights in small flocks. In Peltsheep the adjusted weights for triplets were significantly too high in large flocks. Significant interaction effects were found predominantly between production level and ewe age and between production level and sex which resulted in too high adjusted weights for lambs after both one- and two-year old ewes and for ram lambs in flocks with high production level. Interaction effects in the Lf-, Lr- and X*X-breeds were seldom observed and did not deviate from their respective breed groups. The results of this study do not motivate special sets of adjustments which consider region, flock size and production level.

Journal

Acta Agri Scand A Animal Sci – Taylor & Francis

Published: May 1, 1992

Keywords: management interaction; flock-specific adjustments

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