Genetic aspects of growth and maturing rate in trypanotolerant beef cattle: N'Dama

Genetic parameters for Absolute Growth Rate (AGR), Relative Growth Rate (RGR) and Absolute Maturing Rate (AMR) at various age interval from birth to maturity in N 'Dama beef cattle raised in the humid Tropics of Nigeria were estimated. Performance data used were accumulated between 1948 and 1964 at Fasola cattle ranch in Oyo, Nigeria and the number of records analysed ranged from 44 to 678. prewering (B - W) growth and maturing rates in N’Dama calves were 0.377 ± 0.009 kg/day (AGR), 0.643 ± 0.006 %/day (RGR) and 0.120 ± 0.003% A/day (AMR) and fluctuated subsequently, following the animals' state of development and certain physiological stress conditions. At post weaning (W-12), these rates decreased to 0.249 ± 0.049 kg/day, 0.204 ± 0.029 %/day and 0.075 ± 0.014 % A/day for AGR, RGR and AMR respectively. Estimates of heritability at the various age intervals were considered low in these growth traits with values obtained ranging from 0.03 to 0.24 for AGR, 0.03 to 0.21 for RGR and 0.02 to 0.42 for AMR, with high standard errors. The low estimates though, consistent with literature reports were attributed to the poor standard of animal management and production environment at Fasola. It was evident from this study that selection of N'Dama calves based on post weaning (W-12) growth or maturing rates would yield substantial genetic progress. However, improved animal management and production environment on the ranch would not only improve precision of the genetic parameter estimates but would also enhance N 'Dama growth performance generally.

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Genetic parameter estimates for feeding pattern and production traits in pigs

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200594721 ◽

1997 ◽

Vol 1997 ◽

pp. 31-31

Author(s):

A.D. Hall ◽

W.G. Hill ◽

P.R. Bampton ◽

A.J. Webb

Keyword(s):

Feed Intake ◽

Genetic Parameters ◽

Genetic Parameter ◽

Feeding Pattern ◽

Parameter Estimates ◽

Group Housing ◽

Production Traits ◽

Production Environment ◽

Feeding Patterns ◽

Potential Benefits

Until recently, to enable accurate recording of feed intake, pigs were kept in individual pens. The advent of electronic feeders has allowed accurate records of feed intake and feeding patterns in group housing which is more similar to that found in the production environment. The objectives of this study were to estimate genetic parameters for these feeding pattern traits and their correlations with production traits to show potential benefits in selection.

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PSIII-8 Genetic Parameter Estimates for Bull Prolificacy and Its Relationship with Scrotal Circumference in a Commercial Beef Cattle Population

Journal of Animal Science ◽

10.1093/jas/skab054.271 ◽

2021 ◽

Vol 99 (Supplement_1) ◽

pp. 158-159

Author(s):

Chad A Russell ◽

E J Pollak ◽

Matthew L Spangler

Keyword(s):

Beef Cattle ◽

Breeding Season ◽

Random Effects ◽

Fixed Effects ◽

Genetic Parameter ◽

Additive Genetic Effect ◽

Parameter Estimates ◽

Contemporary Group ◽

Scrotal Circumference ◽

Heritability Estimates

Abstract The commercial beef cattle industry relies heavily on the use of natural service sires. Either due to the size of breeding herds or to safe-guard against injury during the breeding season, multiple-sire breeding pastures are utilized. Although each bull might be given an equal opportunity to produce offspring, evidence suggest that there is substantial variation in the number of calves sired by each bull in a breeding pasture. DNA-based paternity assignment enables correct assignment of calves to their respective sires in multi-sire pastures and presents an opportunity to investigate the degree to which this trait complex is under genetic control. Field data from a large commercial ranch were used to estimate genetic parameters for calf count (CC; n=623) and yearling scrotal circumference (SC; n=1962) using univariate and bivariate animal models. Average CC and SC were 12.1±11.1 calves and 35.4±2.30 cm, respectively. Average number breeding seasons per bull and bulls per contemporary group were 1.40 and 24.9, respectively. The model for CC included fixed effects of age during the breeding season (in years) and contemporary group (concatenation of breeding pasture and year). Random effects included additive genetic and permanent environmental effects, and a residual. The model for SC included fixed effects of age (in days) and contemporary group (concatenation of month and year of measurement). Random effects included an additive genetic effect and a residual. Univariate model heritability estimates for CC and SC were 0.237±0.156 and 0.456±0.072, respectively. Similarly, the bivariate model resulted in heritability estimates for CC and SC of 0.240±0.155 and 0.461±0.072, respectively. Repeatability estimates for CC from univariate and bivariate models were 0.517±0.054 and 0.518±0.053, respectively. The estimate of genetic correlation between CC and SC was 0.270±0.220. Parameter estimates suggest that both CC and SC would respond favorably to selection and that CC is moderately repeatable.

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Quantitative genetic parameter estimates for size and growth rate traits in Pacific white shrimp, Penaeus vannamei (Boone 1931) when reared indoors

Aquaculture Research ◽

10.1046/j.1365-2109.2003.00851.x ◽

2003 ◽

Vol 34 (7) ◽

pp. 543-553 ◽

Cited By ~ 42

Author(s):

Carlos I Pérez-Rostro ◽

Ana M Ibarra

Keyword(s):

Growth Rate ◽

Genetic Parameter ◽

Pacific White Shrimp ◽

White Shrimp ◽

Parameter Estimates ◽

Penaeus Vannamei ◽

Quantitative Genetic

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Genetic parameter estimates for early growth traits in Naeini goat

Animal Production Science ◽

10.1071/an12045 ◽

2012 ◽

Vol 52 (11) ◽

pp. 1046 ◽

Cited By ~ 7

Author(s):

Hasan Baneh ◽

Mojtaba Najafi ◽

Ghodrat Rahimi

Keyword(s):

Environmental Effects ◽

Variance Components ◽

Genetic Parameters ◽

Growth Traits ◽

Genetic Parameter ◽

Average Daily Gain ◽

Parameter Estimates ◽

Estimate Variance ◽

Daily Gain ◽

Birth Type

The present study was carried out to estimate variance components for growth traits in Naeini goats. Bodyweight records were collected for two flocks under supervision of the Agriculture Organisation of the Esfahan province between 2000 and 2007. Investigated traits were birthweight (BW; n = 2483), weaning weight (WW; n = 1211) and average daily gain from birth to weaning (ADG; n = 1211). Environmental effects were investigated using fixed-effect models, while (co)variance components and genetic parameters were estimated with single- and three-trait analyses using REML methods and WOMBAT software. Six different animal models were fitted to the traits, with the best model for each trait determined by log-likelihood ratio tests (LRT). All traits were significantly influenced by herd, birth year, sex of the kid, birth type and dam age (P < 0.01). On the basis of LRT, maternal permanent environmental effects (c2) were significant for WW and ADG, while BW was affected only by direct genetic effects. Direct heritability estimates for BW, WW and ADG were 0.25 ± 0.05, 0.07 ± 0.06 and 0.21 ± 0.11, respectively. The estimate of c2 was 0.16 ± 0.06 for both WW and ADG. Estimates of genetic correlation for BW–ADG, BW–WW and ADG–WW were 0.49, 0.61 and 0.94, respectively. The estimated phenotypic correlations were positive and were between 0.03 (BW–ADG) and 0.95 (ADG–WW). These results indicate that selection can be used to improve growth traits in this goat breed.

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Genetic parameter estimates for serum insulin-like growth factor-I concentration and carcass traits in Angus beef cattle.

Journal of Animal Science ◽

10.2527/2000.7892305x ◽

2000 ◽

Vol 78 (9) ◽

pp. 2305 ◽

Cited By ~ 33

Author(s):

M E Davis ◽

R C Simmen

Keyword(s):

Growth Factor ◽

Beef Cattle ◽

Serum Insulin ◽

Genetic Parameter ◽

Carcass Traits ◽

Parameter Estimates ◽

Insulin Like Growth Factor ◽

Factor I ◽

Growth Factor I

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Comparison of genetic and phenotypic parameters in a purebred and a synthetic beef cattle population

Canadian Journal of Animal Science ◽

10.4141/cjas91-036 ◽

1991 ◽

Vol 71 (2) ◽

pp. 279-285 ◽

Cited By ~ 2

Author(s):

M. F. Liu ◽

M. Makarechian ◽

R. T. Berg

Keyword(s):

Growth Rate ◽

Birth Weight ◽

Beef Cattle ◽

Variance Components ◽

Growth Traits ◽

Cattle Population ◽

Coefficients Of Variation ◽

Sib Families ◽

Phenotypic Variations ◽

Two Populations

Genetic and phenotypic parameters of growth traits from birth to 1 year of age were compared in a multibreed Beef Synthetic (SY) and a purebred Hereford (HE) population managed together under the same environmental conditions and selected for growth rate from 1961 to 1979. Growth traits studied were birth weight, preweaning and postweaning gains. Records of 2077 calves of 70 HE and 100 SY paternal half-sib families were used for analysis. Except for birth weight, phenotypic variances of growth traits were similar for the synthetic (SY) and purebred (HE) populations, but genetic variances were larger in SY than in HE for all growth traits except postweaning gain in males. The coefficients of variation were comparable for all the traits studied in the two populations, indicating that phenotypic variations in the multibreed population and the purebred population were similar. Key words: Variance components, heritability, beef cattle

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Natural variation and genetic parameters in Fraser fir for growth and Christmas tree traits

Canadian Journal of Forest Research ◽

10.1139/x94-191 ◽

1994 ◽

Vol 24 (7) ◽

pp. 1480-1486 ◽

Cited By ~ 12

Author(s):

R.J. Arnold ◽

J.B. Jett ◽

S.E. McKeand

Keyword(s):

Growth Traits ◽

Genetic Parameter ◽

Genetic Correlations ◽

Christmas Tree ◽

Parameter Estimates ◽

Early Age ◽

Individual Tree ◽

Fraser Fir ◽

Seed Sources ◽

Height Class

Open-pollinated progeny trials of Fraser fir (Abiesfraseri (Pursh) Poir.) assessed at 8 years provided genetic parameter estimates for growth, Christmas tree quality traits, and wholesale value at harvest age. Significant variation was found between and within nine different seed sources. Estimated individual tree heritabilities of important traits ranged from a low of 0.13 for USDA Christmas tree grade to a moderate value of 0.33 for crown diameter. Heritabilities within the better performing seed sources tended to be higher. Of the two traits that determine wholesale value, USDA grade and height class, the latter proved to have the greater influence, both phenotypically and genetically. Genetic correlations of early age height growth with 8-year total height, height class, USDA Christmas tree grade, and individual tree wholesale value proved favorable and strong (range of 0.57–0.96). In combination with moderate heritabilities for early growth traits, such correlations provide potential for effective early age selections in Fraser fir Christmas trees.

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