Long-term selection for yearling weight or postweaning gain in Angus cattle

Carter, A. H.; Morris, C. A.; Baker, R. L.; Bennett, G. L.; Johnson, D. L.; Hunter, J. C.; Hickey, S. M.

doi:10.1080/00288233.1990.10430660

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Some studies have shown that maternal effects positively and significantly contributed to correlated responses in weaning and yearling weights (Herd, 1990;MacNeil et al, 1992;Koch et al, 1994), while other reports have shown marginal contribution (Carter et al, 1990;Morris et al, 1992). Arthur et al (1997) noted that the differences may partly be due to the absolute importance of maternal ability on expression of growth and partly due to the magnitude and sign of genetic correlations between direct and maternal effects.…”

Section: Resultsmentioning

confidence: 99%

Long-term selection experiment with Afrikaner cattle 3. Selection applied and response in calf growth traits

2009

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________________________________________________________________________________ AbstractA selection and line x environment interaction study with grade Afrikaner cattle was established in 1956 at Matopos Research Station, Zimbabwe. Two selection lines of 100 cows each were reared in different management environments. The non-supplemented (NS) line relied on the range throughout the year and was mated to calve with the onset of the rains (December to February). The supplemented (S) line was offered protein-rich supplements during the dry season and mated to calve prior to the onset of the rains (October to December). In 1976, after approximately two generations of selection, lines were sub-divided into 75 cows each, where one sub-line remained within each environment as a control; the remaining sub-lines were interchanged between environments. Bulls were selected on weaning weight within control lines, while replacement heifers were selected on weight at mating within sub-line. Data recorded over approximately six generations of selection (40 years) were analyzed. The average age of sires and dams at the time of birth of their progeny was 5.9 and 7.5 years respectively in the pre-crossover phase and was reduced to 4.4 and 6.5 years respectively in the post-crossover phase. The rate of inbreeding across lines and environments was 1.2%/generation. The cumulative selection differential trends for both the S and NS lines for adjusted weaning weight plotted against generation number were very low, relatively linear and greater for the S line (0.10 s.d./year) compared with the NS line (0.08 s.d./year). Direct and correlated responses were uniformly low, approximating 1% of the trait mean per generation, and indicating that considerable attention was given to secondary characters. These results concur with general findings of effective direct and correlated responses of weight traits to individual selection. ________________________________________________________________________________

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Section: Resultsmentioning

confidence: 99%

Long-term selection experiment with Afrikaner cattle 3. Selection applied and response in calf growth traits

2009

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“…This created a gene pool from lines originally selected for increased growth in 1964-1981(Carter et al 1990). …”

Section: Methodsmentioning

confidence: 99%

Genetic parameters for growth, puberty, and beef cow reproductive traits in a puberty selection experiment

Morris

Wilson

Bennett

et al. 2000

New Zealand Journal of Agricultural Research

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A selection experiment to change reproductive traits in Angus cattle has been maintained for 14 years, with first calvings in 1985. Alongside an unselected control line, three lines were established, selected for increased age at puberty in heifers (AGE+ line), reduced age at puberty in heifers (AGE-line), or increased scrotal circumference (SC line). The last two lines were merged at the 1992 matings, with the revised objective of applying further selection in both sexes to reduce age at puberty in heifers. Dates at puberty in heifers from an average of 8 to 16 months of age and SC in bulls were recorded in all lines, along with the pregnancy rates (PR) and subsequent calving dates (CD) in heifers and all cow-age groups. Heritabilities of single-record SC, standardised age at first behavioural oestrus (SFO), and single-record CD were 0.41 ± 0.04 (repeatability 0.70 ± 0.01), 0.27 ± 0.04, and 0.09 ± 0.04 (repeatability 0.19 ±0.03), respectively. Genetic correlations of SC with SFO and CD were -0.25 ± 0.09 and -0.23 ± 0.15, respectively; SFO with CD 0.57 ± 0.17; and PR with SFO and SC-0.36 ±0.13 and 0.12 ± 0.11, respectively. The selection-line difference in PR over seven years (AGE-mean minus AGE+ mean), excluding yearling heifer matings, was 4.7 ± 2.1% (P < 0.05). Mean CD in the AGE-line was 3 days earlier than in the AGE+ line (P < 0.09). These correlation and selection-line results suggest that selecting for higher SC and earlier heifer puberty leads to earlier CD and higher PR.

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Macro- and micro-genetic environmental sensitivity of yearling weight in Angus beef cattle

Madsen,

van der Werf,

Clark

2024

animal

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Long-term selection for yearling weight or postweaning gain in Angus cattle

Cited by 7 publications

References 18 publications

Long-term selection experiment with Afrikaner cattle 3. Selection applied and response in calf growth traits

Long-term selection experiment with Afrikaner cattle 3. Selection applied and response in calf growth traits

Genetic parameters for growth, puberty, and beef cow reproductive traits in a puberty selection experiment

Macro- and micro-genetic environmental sensitivity of yearling weight in Angus beef cattle

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