Changes in Beef Cattle Performance After Ten Years of Yearling Weight Selection

Olthoff, John; Crow, G. H.; Rahnefeld, G. W.

doi:10.4141/cjas90-125

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The conclusion that birth weight will increase as a correlated response to selection for increased yearling weight (Olthoff et al, 1990;Morris et al, 1992;Koch et al, 1994) seems unequivocal. Most of this correlated response originates from direct effects, as shown either by the within-line results (MacNeil et al, 1998) or line-cross results (Koch et al, 1995).…”

Section: Resultsmentioning

confidence: 99%

Progeny testing sires selected by independent culling levels for below-average birth weight and high yearling weight or by mass selection for high yearling weight.

MacNeil

Short²,

Urick³

1999

Journal of Animal Science

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Breeding values of sires resulting from selection either for reduced birth weight and increased yearling weight (YB, n = 8) or for increased yearling weight alone (YW, n = 9) were compared with each other and with sires representative of the population before selection began (BS, n = 12) using progeny testing. Reference sires (n = 6) connected these Line 1 sires with the Hereford international genetic evaluation. Thirty-five sires produced 525 progeny that were evaluated through weaning. After weaning, 225 steer progeny were individually fed, slaughtered, and carcass data collected. Data were analyzed using restricted maximum likelihood procedures for multiple traits to estimate breeding values for traits measured on the top-cross progeny while simultaneously accounting for selection of the sires. Results of the progeny test substantiate within-line results for traits upon which sires were selected. Breeding values for gestation length were greater in YB sires than in YW sires and were unchanged relative to BS sires. Breeding values for growth rate and feed intake for the YB and YW sires were greater than for BS sires. Predicted breeding values for indicators of fat deposition tended to be greater in YB sires and less in YW sires relative to BS sires, although YB and YW sires had similar breeding values for marbling score. Selection based on easily and routinely measured growth traits, although achieving the intended direct responses, may not favorably affect all components of production efficiency. Further, divergence of selection lines may not be easily anticipated from preexisting parameter estimates, particularly when selection is based on more than one trait.

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Section: Resultsmentioning

confidence: 99%

Progeny testing sires selected by independent culling levels for below-average birth weight and high yearling weight or by mass selection for high yearling weight.

MacNeil

Short²,

Urick³

1999

Journal of Animal Science

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“…Sapi Ongole memiliki nilai R Y tertinggi pada BS (1,41 kg) dan BY (2,65 kg) pada kombinasi pola pembiakan pejantan 3 tahun dan induk 8 tahun pada lokasi yang sama (Duma 1997). Sapi Shorthorn memiliki nilai R Y tertinggi untuk BL (0,30 kg), BS (2,10 kg) dan BY (5,10 kg) pada pola kombinasi pembiakan pejantan 3 tahun dan betina 9 tahun (Olthoff et al 1990). Sapi N'Dama mempunyai nilai R Y tertinggi pada BD sebesar 0,18 kg pada kombinasi pola pembiakan pejantan 2 tahun dan induk 6 tahun dengan nilai L sebesar 5,5 tahun (Bosso et al 2009).…”

Section: Respon Seleksi Langsungunclassified

Response to selection of growth traits in Aceh cattle

Putra¹,

Sumadi²,

Tety³

et al. 2015

JITV

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This research aimed to find out the predicted genetic progress for Aceh cattle by several growth traits selection such as birth weight (BW), weaning weight (WW), yearling weight (YW), mature weight (MW), and to estimate of does to identify the best selection response of breeding pattern bulls and cows. The recorded of production and reproduction of Aceh cattle from 2010 to 2014 at breeding centre were analyzed and used as a technical coefficient on estimate heritability (h 2), genetic correlation (r G), direct response to selection (R Y) and correlated response to selection (CR Y) on several breeding patterns. Most of h 2 and r G values among growth traits were positive and high. The highest value of Ry was found on BW (0.04), WW (1.21), YW (2.05), MW (3.28) and this was obtained from breeding pattern of using bull for 3 years and cow for 6 years. The indirect selection or CR Y value based on BW was lower than that on WW. It is concluded that WW might be used as selection criterion in order to increase WW, YW and MW.

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Correlated responses in productive and adaptive traits and temperament following selection for growth and heat resistance in tropical beef cattle

Burrow

Prayaga

2004

Livestock Production Science

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Changes in Beef Cattle Performance After Ten Years of Yearling Weight Selection

Abstract: performance after ten years of yearling weight selection. Can. J. Anim. Sci pour le gain quotidien moyen en pr6-sevrage. On n'observe aucune modification significative dans la survie des veaux ni dans la performance de la production des vaches.

Cited by 3 publications

References 5 publications

Progeny testing sires selected by independent culling levels for below-average birth weight and high yearling weight or by mass selection for high yearling weight.

Progeny testing sires selected by independent culling levels for below-average birth weight and high yearling weight or by mass selection for high yearling weight.

Response to selection of growth traits in Aceh cattle

Correlated responses in productive and adaptive traits and temperament following selection for growth and heat resistance in tropical beef cattle

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