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Corresponding estimates of direct-maternal genetic correlations wereand and for the proportional permanent environmental variance due to. Estimates of direct, maternal and grandmaternal genetic effects for growth traits in Gobra cattle Article (PDF Available) in Genetics and Molecular Biology 22(3) September with 30 Reads.
Calves from F 1 dams had larger preweaning gains than those of the other breedtypes. The Brahman direct additive effect on preweaning gain was kg less than Hereford and the Brahman maternal additive effect was 20 kg greater than Hereford.
Direct and maternal heterotic effects on preweaning gain were and kg, by: Research Direct-maternal genetic correlations for preweaning growth in Hereford cattle book Performance, Heterosis, and Direct and Maternal Breed Effects in Angus, Hereford, Red Poll, Santa Gertrudis, and Reciprocal-Cross Calves E.L.
Oxford, * A.H. Brown, Jr. PAS â€ [email protected] Z.B. Johnson, PAS â€ G.T. Tabler, â€ B.R. Kutz, â€ * Department of Statistics, Tyson Foods Inc., Springdale, AR Department of Statistics, Tyson Foods Inc. Cited by: 3. Genetic correlations between the traits and between parities within traits were generally moderate to high and positive.
Calving difficulty score should be included in the genetic evaluation of beef breeds in Sweden, whereas progeny groups in Swedish beef populations are too small for stillbirth to be considered by: The results showed that the growth traits have an important genetic component, which is a favorable indicator for obtaining improvement progress in the zebu Brahman breed for beef production in tropical regions of Colombia.
The maternal effects influenced the weight performance from 4 to 18 mo and should be taken into account in genetic by: 4. ¾Sire x maternal grandsire interaction effects were important for pre-weaning growth traits, and may need to be included in genetic evaluation models for Brazilian Nellore cattle.
¾Trends for direct and maternal EPD means showed small genetic changes during this year period, particularly for maternal effects. The direct -maternal genetic correlations (r dm) were high (-0,52 to -0,88) and negative for all breeds.
Similar results have been rep orted by Meyer (, ) and by Koots et al. () who also found strong negative direct -maternal genetic correlations.
Several estimates of direct -maternal correlation reported by Mohuiddin. The best model (Model 4) showed that fitting the direct-maternal genetic covariance resulted to estimates of direct-maternal genetic correlation (r am) of − and − for BW and W30d, respectively.
Maniatis and Pollot () reported that the higher negative estimates may be attributed to the data by: 6. ESTIMATES OF DIRECT, MATERNAL AND GRANDMATERNAL GENETIC EFFECTS FOR GROWTH TRAITS IN GOBRA CATTLE M.
Diop 1, J. Dodenhoff and L.D. Van Vleck2 ABSTRACT Estimates of genetic parameters for birth (N = ), weaning (N = ), yearling (N = ) and final (N = ) weights.
Description Direct-maternal genetic correlations for preweaning growth in Hereford cattle PDF
Heritability estimates for growth rate in those European limit-fed swine reared at central test stations range form to Backfat heritability estimates vary from to Esti- mates of the genetic correlation between backfat and growth rate range from to + There have been very few heritability estimates.
Early growth of mammals is subject to maternal effects, both genetic and environmental, which increases the complexity of appropriate analyses. This paper presents a RR analysis of weights of beef calves from birth to weaning, attempting to separate direct.
genetic differences among inbred lines or groups being crossed. The goal of this study was to estimate the effects of inbreeding and effects of heterozygosity of line crosses on preweaning traits in a closed popula-tion of Hereford cattle under selection.
Materials and Methods By the late s, corn breeders had achieved. The pre-weaning growth of lambs, an important component of meat production, depends on maternal and direct effects. These effects cannot be observed directly and models used to study pre-weaning growth assume that they are additive.
However, it is reasonable to suggest that the influence of direct effects on growth may differ depending on the value of Cited by: 1.
Hohenboken W D and Brinks J S Relationships between direct and maternal effects on growth in Herefords: II Partitioning of covaríance between relatives. Sci., v, p Lee C and Pollak E J Relationship between Sire x Year Interactions and Direct-Maternal Genetic Correlation for Weaning Weight of Simmental Cattle.
correlations between BW and several growth traits such as weaning and yearling weight (9,10). Direct heritability for birth weight of calves examined was between and by Ulutaﬂ (11). The ranges of maternal heritability for birth weight were reported between and for 5 different cattle breeds (12).
Improved. Estimation of genetic parameters for preweaning traits in cattle 7. A sire, maternal grandsire and dam nested model (SHI et al.
) allowing to estimate all the components appearing in 4.
Details Direct-maternal genetic correlations for preweaning growth in Hereford cattle FB2
Parameters estimated were: a2 = af+a,+ak+af+af h2 = af/a2 m2 = uZ,/a2 2 = aya2 ram = a,/(a,a3. Parameter Estimates for Direct, Maternal, and Grandmaternal Genetic Effects for Birth Weight and Weaning Weight in Hereford Cattle J. Dodenhoff University of Nebraska-Lincoln L.
Dale Van Vleck University of Nebraska-Lincoln, [email protected] Stephen D. Kachman University of Nebraska-Lincoln, [email protected] R. Koch. populations in genetic parameters were indicated, especially maternal d weight and its correlations with other traits.
Key Words: Cattle, Growth, Breeds, Genetic Parameters, Milk Yield J. Anim. Sci. – Introduction Genetic (co)variance candiffer among cattle popu-lations for several reasons. Genetic variance in. genetic correlations between direct and maternal effects of pre and post-weaning weights of Tabapuã cattle raised on pasture, in different regions of Brazil.
Estimates obtained with single-trait analyses with four different models, were compared to quantify the importance of direct and maternal genetic effects, as. Records of 5 inbred lines at the Livestock and Range Research Laboratory were used to evaluate effects of inbreeding and heterozygosity on preweaning traits.
Members of each line were descendants of a single founder Hereford bull. A total of records of birth weight and records of preweaning daily gain and weaning weight were analysed by derivative-free Cited by: cattle evaluations (Beckman et al., ; Norris et al., ). The phenotype that is currently used in national cattle evaluations is the subjective measure of chute score (Beef Improvement Federation, ).
Genetic parameters for docility, weaning weight, yearling weight, and intramuscular fat percentage in Hereford cattle1. Heritability estimates, obtained with the most complete model, were low:and for direct genetic effects, andand for maternal genetic effects, for W, W and W, respectively.
Estimates of genetic correlation between direct and maternal effects were negative, showing an antagonism between such effects. Genetic Parameters for Direct anD maternal effects anD an estimation of BreeDinG Values for Birth WeiGht of holstein friesian calVes A.
KAYGISIZ1, G. BAKIR2 and I. YILMAZ3 1 Kahramanmaras Sutcu Imam University, Department of Animal Science, Faculty of. factors affect the birth weight and preweaning growth of lambs. These factors include direct genetic effects, maternal genetic effects and environmental factors, which affect both the lamb and its dam.
Hence, to achieve optimum genetic progress in a selection program both the direct and maternal components should be taken into account (3,4).
Download Direct-maternal genetic correlations for preweaning growth in Hereford cattle PDF
Two genetic factors have impact on the weaning weight of a calf; the genetic merit of the calf for growth rate (direct), and the genetic merit of the dam for milk production (maternal). Direct weaning weight EPDs are the best estimate of preweaning growth, while milk EPDs are the best estimate of genetic merit for theFile Size: KB.
Orders of polynomial fit up to 6 were considered. Analyses were carried out fitting sets of random regression coefficients due to animals' direct and maternal, additive genetic and permanent environmental effects, with changes in variances due to temporary environmental effects modelled through a variance function, estimating up to 67 by: CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Records for birth and subsequent, monthly weights until weaning on beef calves of two breeds in a selection experiment were analysed fitting random regression models.
Independent variables were orthogonal (Legendre) polynomials of age at weighing in days, and orders of polynomial fit up. direct genetic effects. Correlations between direct and maternal effects for each trait were negatively correlated ( - ).
This study suggested that maternal additive genetic variance would be not ignorable for genetic evaluation of milk production as well as reproductive traits such as calving ease and days open at first parity.
The direct and maternal heritabilities for GL estimated from M1 were andrespectively. This result shows that GL is moderately inherited and can be controlled genetically.
The direct × maternal genetic correlation for GL was − Direct genetic correlations of GL with carcass traits were close to zero. that genetic variance for direct eff ect(s) on conception rate is low (repeatability=; heritability=) and raw conception rate is poorly related to solutions from prediction models.
If the service sire is a diagonal eff ect, rank correlations with raw.Realized genetic correlations estimated from selection for a single trait are genetic variance, or the direct-maternal covariance.
If this covariance is negative, response to selection will be diminished, since changes in direct effects Hereford cattle. J. Anim.Full text of "Animal breeding: recent advances and future prospects" See other formats.
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