Effectiveness of Selecting for Rapid and for Slow Growth Rate in Hampshire Swine

Krider, J. L.; Fairbanks, B. W.; Carroll, W. E.; Roberts, E.

doi:10.2527/jas1946.0513

Cited by 25 publications

(14 citation statements)

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“…The increased weight at 70 d in pigs sired by select-line boars and the increased postweaning growth in pigs out of select-line sows compared to the control-line pigs agrees with the results observed by Krider et al (1946), Craig et al (1956), and Rahnefeld and Gamett (1976). D i r e c t selection for increased 70-d weight would be expected to influence preweaning traits.…”

Section: Resultssupporting

confidence: 83%

“…Mass selection for growth rate in pigs has been effective even though different selection criteria have been used. Krider et al (1946) and Craig et al (1956) found that selection of pigs for increased weight at 180 or 150 d was effective in increasing growth rate. Rahnefeld and Garnett (1976) and Fredeen and Mikami (1986) reported that selection for increased 'Contribution from the Alabama Agric.…”

Section: Lntrod U Ct I Onmentioning

confidence: 99%

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Effects of mass selection for increased weight at two ages on growth rate and carcass composition of Duroc-Landrace pigs.

Bullock

Kuhlers²,

Jungst³

1991

Journal of Animal Science

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Duroc boars from a line previously selected over five generations for 200-d weight and those from a randomly selected control line were mated to Landrace sows either from a line previously selected for increased 70-d weight or from a randomly selected pedigree control line. From these matings, 900 pigs were farrowed to examine the effects of crossing lines of pigs mass selected for weight at two ages on growth rate, survival, and carcass composition. A greater (P less than .01) percentage of pigs farrowed survived birth from control-line sows (.974) than from select-line sows (.914). Of those pigs born alive, a greater (P less than .05) percentage of pigs out of control-line sows survived to 21 d (.893) than out of select-line sows (.829). Pigs sired by select-line boars weighed 2.1 kg heavier (P less than .05) at 70 d than pigs sired by control-line boars. Pigs out of select-line sows weighed .11 kg less (P less than .10) at birth and .3 kg less (P less than .10) at 21 d of age but grew .026 kg/d faster (P less than .10) from 70 d to slaughter, weighed 3.9 kg more at 165 d of age (P less than .05), and reached 100 kg 7.0 d sooner (P less than .05) than pigs out of control-line sows. Carcasses from barrows sired by select-line boars had .29 cm more (P less than .10) fat at the 10th-rib than carcasses from barrows sired by control-line boars. Marbling scores were .31 unit greater (P less than .05) and muscle color scores were .25 unit greater (P less than .10) for carcasses from pigs out of select-line sows than for carcasses from pigs out of control-line sows. Selection for increased 70-d weight decreased age at 100 kg without increasing fat deposition. However, survival rates up to 100 kg were reduced. Mass selection for 200-d weight effectively increased 70-d weight, but fat thickness at 100 kg also increased.

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Section: Resultssupporting

confidence: 83%

Section: Lntrod U Ct I Onmentioning

confidence: 99%

Effects of mass selection for increased weight at two ages on growth rate and carcass composition of Duroc-Landrace pigs.

Bullock

Kuhlers²,

Jungst³

1991

Journal of Animal Science

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show abstract

“…High-low selection for 180 days weight did not affect birth or 21 days weights, but gave differences in 56 days weight in the fourth generation (Krider et al, 1946). After eight and nine generations in the slow and rapid line, respectively, the lines also diverged in birth and Fredeen, 1958).…”

Section: Litre Arid Generationmentioning

confidence: 93%

Preweaning Weights in Lines of Pigs Selected for Rate of Gain and Thickness of Backfat

Vangen

1974

Acta Agriculturae Scandinavica

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“…Although such experiments have been reported in swine (Krider et al, 1946) and mice (Mac-Arthur, 1944;Falconer, 1953), detailed reports of two-way selection experiments for body weight in chickens are lacking. If most of the gene action is of the additive type, individual phenotypic selection should be effective in changing the population means for this characteristic in either an upward or a downward direction.…”

mentioning

confidence: 99%

Selection for Body Weight at Eight Weeks of Age

Siegel

1962

Poultry Science

175

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Effectiveness of Selecting for Rapid and for Slow Growth Rate in Hampshire Swine

Cited by 25 publications

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Effects of mass selection for increased weight at two ages on growth rate and carcass composition of Duroc-Landrace pigs.

Effects of mass selection for increased weight at two ages on growth rate and carcass composition of Duroc-Landrace pigs.

Preweaning Weights in Lines of Pigs Selected for Rate of Gain and Thickness of Backfat

Selection for Body Weight at Eight Weeks of Age

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