Factors Affecting Birth Weights of Crossbred Lambs

Bogart, Ralph; deBaca, R. C.; Calvin, Lyle D.; Nelson, Oran M.

doi:10.2527/jas1957.161130x

Cited by 11 publications

(11 citation statements)

References 8 publications

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“…(30%) (Bogart et al, 1957), and at weaning from 8 lb. The effects of age and live-weight of dam have not yet been studied sufficiently for any definite recommendations.…”

Section: Discussionmentioning

confidence: 99%

Crossbred sheep production I. Factors affecting production from the crossbred ewe flock

Yalçin

Bichard

1964

Anim. Sci.

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Donald (1962) has recently pointed out the paucity of available data on production from British sheep, though some information is available for hill sheep (see for example Donald, 1958; Purser and Roberts, 1959; Purser and Young, 1959; Dalton, 1962). Most of these refer mainly to the Scottish Blackface and Welsh Mountain breeds. Hill sheep form approximately 40% of the national flock of over 11 million breeding ewes. Another 40% of ewes are found in crossbred flocks mainly kept on the lowlands; these produce fat lambs and hoggets with wool as a secondary product. Very little information has so far been published on these crossbred ewes, exceptions being work reported by Bywater (1945) and Rennie (1957). This is the first of three papers to be presented with the object of providing such information, and is based mainly on the work of Yalçin (1963). It is hoped that these papers will be of use on two counts:1. To provide a documentation of one specific cross, the Border Leicester × Cheviot ewe and her Suffolk-cross lambs under North of England grassland conditions.2. To analyse the usefulness of keeping production records within such flocks as aids to good commercial management, to culling and to selective breeding.In this paper the traits studied are body weight, fleece weight and litter size of the ewes, and the weights of the lambs between birth and slaughter or weaning. Estimates were obtained for the effects upon some of these traits of age and live-weight of ewe, and of sex, year and type of birth and rearing of the lambs. The usefulness of such correction factors is considered within recording schemes. In subsequent papers the effects on production of differences between crossbred ewes and between the rams used as fat lamb sires will be considered.

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“…(30%) (Bogart et al, 1957), and at weaning from 8 lb. The effects of age and live-weight of dam have not yet been studied sufficiently for any definite recommendations.…”

Section: Discussionmentioning

confidence: 99%

Crossbred sheep production I. Factors affecting production from the crossbred ewe flock

Yalçin

Bichard

1964

Anim. Sci.

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“…instead of 2-7 lb. Bogart et al (1957) report from Oregon a sex effect varying from 0-3 to 0-4 lb. In data from Shropshire and Cheviot flocks, Johansson and Hansson (1943) found sex effects averaging 0-4 lb.…”

Section: Birth Weightsmentioning

confidence: 99%

Effect on production records of sex of lamb, twinning, and dam's age in a grassland flock

Donald¹

1962

Anim. Sci.

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“…Blackwell and Henderson (1955) stated that years were impor tant sources of variation due to the weather and the general health of the flock. Bogart ^ al. (1957) found similar results.…”

Section: Birth Weightmentioning

confidence: 99%

“…*+8 pounds more than those from two-year old ewes foiTthe Rambouillet and Corriedale breeds, respectively. Bogart et al (1957) used the least squares method for fitting constants to measure environmental effects on birth weight. They found no significant difference due to breed of dam.…”

Section: Birth Weightmentioning

confidence: 99%

Genetic and environmental factors of sheep under arid conditions

Eltawil

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Factors Affecting Birth Weights of Crossbred Lambs

Cited by 11 publications

References 8 publications

Crossbred sheep production I. Factors affecting production from the crossbred ewe flock

Crossbred sheep production I. Factors affecting production from the crossbred ewe flock

Effect on production records of sex of lamb, twinning, and dam's age in a grassland flock

Genetic and environmental factors of sheep under arid conditions

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