Relationships among Absolute Growth Rate, Relative Growth Rate and Feed Conversion during Postweaning Feedlot Performance Tests

Brown, A.H.; Johnson, Z. B.; Chewning, J. J.; Brown, C. J.

doi:10.2527/jas1988.66102524x

Cited by 20 publications

(17 citation statements)

References 5 publications

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“…The favorable (negative) genetic correlations between FCR and growth traits observed in our study were in agreement with the estimates by Brown (1988), Fan et al (1995) and Arthur et al (2001a). The high negative genetic relationship between ADG and FCR (À 0.84 and À 0.74 for Angus and Hereford breed, respectively) has been reported by Brown (1988) and (À 0.62 and À 0.57 for Angus and Hereford breed, respectively) by Fan et al (1995).…”

Section: Discussionsupporting

confidence: 94%

“…The high negative genetic relationship between ADG and FCR (À 0.84 and À 0.74 for Angus and Hereford breed, respectively) has been reported by Brown (1988) and (À 0.62 and À 0.57 for Angus and Hereford breed, respectively) by Fan et al (1995). Arthur et al (2001a) found the high negative genetic correlation (À 0.62) between these traits for Angus breed.…”

Section: Discussionmentioning

confidence: 82%

See 1 more Smart Citation

Genetic relationship between different measures of feed efficiency and its component traits in Japanese Black (Wagyu) bulls

et al. 2006

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 82%

Genetic relationship between different measures of feed efficiency and its component traits in Japanese Black (Wagyu) bulls

et al. 2006

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“…In the present study, both MWT and ADG were phenotypically independent of RFI. The favourable (negative) genetic correlations of FCR with growth traits observed in the present study were in agreement with the estimates by Brown (1988); Fan et al (1995) and Arthur et al (2001). Weighted mean values for genetic and phenotypic correlations noted in a review by Koots et al (1994b) were )0.67 and )0.64 for FCR with ADG, respectively, and the corresponding correlations were )0.60 and )0.46 for FCR with yearling weight, respectively.…”

Section: Discussionsupporting

confidence: 92%

Variance components due to direct genetic, maternal genetic and permanent environmental effect for growth and feed‐efficiency traits in young male Japanese Black cattle

Hoque

Arthur

Hiramoto

et al. 2007

J Animal Breeding Genetics

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Variance components and genetic parameters were estimated using data recorded on 740 young male Japanese Black cattle during the period from 1971 to 2003. Traits studied were feed intake (FI), feed-conversion ratio (FCR), residual feed intake (RFI), average daily gain (ADG), metabolic body weight (MWT) at the mid-point of the test period and body weight (BWT) at the finish of the test (345 days). Data were analysed using three alternative animal models (direct, direct + maternal environmental, and direct + maternal genetic effects). Comparison of the log likelihood values has shown that the direct genetic effect was significant (p < 0.05) for all traits and that the maternal environmental effects were significant (p < 0.05) for MWT and BWT. The heritability estimates were 0.20 +/- 0.12 for FI, 0.14 +/- 0.10 for FCR, 0.33 +/- 0.14 for RFI, 0.19 +/- 0.12 for ADG, 0.30 +/- 0.14 for MWT and 0.30 +/- 0.13 for BWT. The maternal effects (maternal genetic and maternal environmental) were not important in feed-efficiency traits. The genetic correlation between RFI and ADG was stronger than the corresponding correlation between FCR and ADG. These results provide evidence that RFI should be included for genetic improvement in feed efficiency in Japanese Black breeding programmes.

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“…Average initial test ages in these data allow bulls to be at least 12 mo of age by d 112 of test. There is a positive relationship between body condition and scrotal circumference (Chewning et al, 1988). Coulter and Foote (1977) reported that cumference measurements 2 to 3 cm greater than bulls in good body condition.…”

Section: Results and Dlscusslonmentioning

confidence: 97%

“…Coulter and Foote (1977) reported that cumference measurements 2 to 3 cm greater than bulls in good body condition. Chewning et al (1988) reported least squares estimates for the effects of initial test weight, backfat, and average daily gain on scrotal c i r d e rence. These estimates could be used to adjust scrotal circumference measurements for these effects, Scrotal circumference has been shown to be a more accurate indicator of puberty in bulls than either age or weight, regardless of breed or breed cross (Lunstra, 1982).…”

Section: Results and Dlscusslonmentioning

confidence: 99%

Effects of 84-, 112- and 140-day postweaning feedlot performance tests for beef bulls.

Brown

Chewning²,

Johnson³

et al. 1991

Journal of Animal Science

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Changes in performance traits in beef cattle over the last 30 yr necessitate the re-evaluation of central testing procedures to ensure that they are cost effective and appropriate for current test objectives. The objective of this study was to evaluate the potential for reducing the length of evaluation from 140 d to either 112 or 84 d. Data evaluated were postweaning feedlot performance test records (collected from 1977 to 1986) on 1,830 individually fed bulls. Bulls representing 13 breeds (n greater than 25 per breed) were evaluated in the University of Arkansas Cooperative Bull Tests at Fayetteville, Hope, and Monticello, Arkansas. Models were fit for ADG, daily feed intake (FI) and feed conversion (FCONV) from d 1 to d 140 (ADG1-140, FI1-140 and FCONV1-140, respectively) and from d 1 to d 112 (ADG1-112, F11-112 and FCONV1-112, respectively). Models fit for ADG1-140, FI1-140, and FCONV1-140 using information up to d 112 had R2 of .90, .99, .88, and .94, respectively, and using information up to d 84 had R2 of .82, .94, and .80, respectively. Spearman rank correlation coefficients (all P less than .0001) were .93 for ADG1-140 and ADG1-112, .93 for ADG1-112 and ADG1-84, .99 for FI1-140 and FI1-112, .91 for FCONV1-140 and FCONV1-112, and .90 for FCONV1-112 and FCONV1-84. These coefficients indicate that bulls ranked similarly for performance traits at 84, 112, and 140 d. If the primary objective of central station testing is to evaluate ADG during the linear phase of growth, and if testing procedures are those currently recommended by the Beef Improvement Federation, then feeding bulls beyond 112 d has no advantage because the information upon which selection decisions are made is similar at both 112 and 140 d.

show abstract

Relationships among Absolute Growth Rate, Relative Growth Rate and Feed Conversion during Postweaning Feedlot Performance Tests

Cited by 20 publications

References 5 publications

Genetic relationship between different measures of feed efficiency and its component traits in Japanese Black (Wagyu) bulls

Genetic relationship between different measures of feed efficiency and its component traits in Japanese Black (Wagyu) bulls

Variance components due to direct genetic, maternal genetic and permanent environmental effect for growth and feed‐efficiency traits in young male Japanese Black cattle

Effects of 84-, 112- and 140-day postweaning feedlot performance tests for beef bulls.

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