BRAHMAN-BRITISH BEEF CATTLE CROSSES IN CANADA: I. WEANED CALF PRODUCTION UNDER RANGE CONDITIONS

1967 ◽  
Vol 47 (3) ◽  
pp. 145-151 ◽  
Author(s):  
H. F. Peters ◽  
S. B. Slen
Keyword(s):  
Beef Cattle ◽  
Standard Errors ◽  
Research Station ◽  
Beef Production ◽  
Weaning Weight ◽  
Extended Study ◽  
Breeding Group ◽  
Hereford Cattle

Three Brahman (B) bulls were mated with Hereford (H), Angus (A) and Shorthorn (S) cows and the F1 progenies were evaluated for beef production in comparison with grade Hereford cattle under range conditions in southeastern Alberta. The crossbred heifers were mated with Hereford bulls, as were their [Formula: see text]-Brahman female progenies. Calves were weaned on November 1 at 6 to 7 months of age.Each of the three Brahman-sire progeny groups, numbering 12, 6 and 146 calves born, averaged higher than contemporary Herefords in performance.B × A and B × S cows surpassed all other groups in weaned calf crop percentage. Hereford calves were lighter than F1 and heavier than [Formula: see text]-Brahman calves at birth. Breeding-group means and standard errors for weaning weight were (a) Generation 1: Hereford, 155 ± 2.2; B × H, 165 ± 2.4; B × A, 176 ± 2.9; and B × S, 175 ± 3.2 kg; (b) Generation 2: Hereford, 150 ± 2.7; H × (B × H), 184 ± 2.2; H × (B + A), 191 ± 2.4; and H × (B × S), 195 ± 2.6 kg; and (c) Generation 3: Hereford, 152 ± 3.8; H × [H × (B × H)], 170 ± 3.2; H × [H × (B × A)], 182 ± 4.1; and H × [H × (B × S)], 186 ± 4.0 kg.An extended study of B × H and Hereford cows showed the crossbreds to be superior in longevity and lifetime productivity.Further exploratory crossbreeding including the Brahman is in progress at the Lethbridge Research Station.

A note on estimates of the repeatability of weaning weight in beef cattle

1968 ◽  
Vol 10 (4) ◽  
pp. 483-486 ◽  
Author(s):  
J. B. Kilkenny
Keyword(s):  
Beef Cattle ◽  
Average Weight ◽  
Beef Production ◽  
Weaning Weight

Profitable beef production in stickler herds depends upon each cow within the herd producing a heavy, well-grown calf every year. The weight of the weaned calf has a large effect on the producer's income. The pedigree beef breeder therefore needs to select female lines within his herd which produce calves above the herd average weight at weaning.

THE BIRTH AND WEANING WEIGHTS OF HIGHLAND AND HEREFORD CATTLE AND THEIR RECIPROCAL CROSSES

1964 ◽  
Vol 44 (2) ◽  
pp. 174-178 ◽  
Author(s):  
J. E. Lawson ◽  
H. F. Peters
Keyword(s):  
Birth Weight ◽  
Environmental Factors ◽  
Sum Of Squares ◽  
Standard Errors ◽  
Weaning Weight ◽  
Comparative Tests ◽  
Reciprocal Crosses ◽  
Hereford Cattle ◽  
Genetic And Environmental Factors

Birth and weaning data were collected from 1957 to 1960 on 219 calves of the Highland and Hereford breeds and their reciprocal crosses. Significant (P < 0.01) effects of breed of calf, age of dam, sex of calf, and date of birth on birth weight, and significant (P < 0.01) effects of breed of calf, year of birth, age of dam, sex of calf, and age of calf on weaning weight, demonstrated the importance of considering both genetic and environmental factors when undertaking comparative tests of breeds and crosses.Breed means and standard errors for birth weight were Hereford, 70.7 ± 0.9; Highland, 63.6 ± 1.0; Highland (sire) × Hereford (dam), 73.6 ± 0.9; and Hereford (sire) × Highland (dam), 70.1 ± 1.1 lb. Weaning weight means and standard errors were: Hereford, 360 ± 5.6; Highland, 339 ± 6.7; Highland × Hereford, 378 ± 6.0; and Hereford × Highland, 385 ± 7.0 lb.The average of the reciprocal crosses exceeded the average of the parental breeds by 7.0% in birth weight and 9.2% in weaning weight.Variability (sum of squares) in birth weight accounted for by breed of calf was about twice that accounted for by age of dam or sex of calf, and about 6 times that contributed by year of birth or date of birth within years. The influence of age of dam on the variability in weaning weight was about twice that accounted for by breed of calf, year of birth, or age of calf, and about 7 times that due to sex of calf.

scholarly journals Detection of GHR|AluI gene polymorphism and its association with body weight of Madura cattle in Indonesian Beef Cattle Research Station

2021 ◽  
Vol 888 (1) ◽  
pp. 012013
Author(s):  
Hartati ◽  
N H Krisna ◽  
F Firdaus ◽  
S P Rahmadani ◽  
B D P Soewandi
Keyword(s):  
Body Weight ◽  
Beef Cattle ◽  
Growth Traits ◽  
Population Sample ◽  
Growth Trait ◽  
Allele Frequencies ◽  
Research Station ◽  
Weaning Weight ◽  
Genotype Frequencies ◽  
Ghr Gene

Abstract Madura cattle is a one of the native cattle that are genetically tolerant of tropical climates. Madura cattle are one of the beef cattle breeds in Indonesia. Madura cattle can be a superior breed, but improving growth trait in Madura cattle needs to be conducted. The early step that was needed was for detecting the genes which were involved in growth traits. The purpose of this research was for detecting GHR gene polymorphisms and its association with body weight of Madura cattle population in Indonesian Beef Cattle Research Station. This study used 110 DNA samples of Madura cattle that was collected from the experimental barn at Indonesian Beef Cattle Research Station. DNA samples were extracted by DNA extraction kit. Genotype of GHR gene was detected by PCR-RFLP method using AluI restriction enzymes. In this study, association genotype and body weight was analysed by univariate GLM method. The birth weight, weaning weight, yearling weight and 18 months weight of Madura cattle were 16.8±0.3 kg; 82.4±2.3 kg; 124.6±3.7 kg and 166.7±5.0 kg, respectively. The GHR genes of Madura cattle had 3 genotypes AA, AG and GG and genotype frequencies of GHR gene were 0.273 (AA), 0.373 (AG), 0.355 (GG), respectively. Whereas the allele frequencies of A was 0.459 and the allele frequencies of G was 0.541. Based on Chi-square (X2) analysis showed that the population sample was not disequilibrium. The result of association analysis was significant (P <0.05) on weaning weight, yearling weight and 18 month weight. It was concluded that the GHR gene has potential as a genetic marker for growth traits and can be used as MAS in Madura cattle in Indonesian Beef Cattle Research Station.

Sire × herd interactions for weaning weight in beef cattle

1992 ◽  
Vol 70 (8) ◽  
pp. 2359-2365 ◽  
Author(s):  
D. R. Notter ◽  
B. Tier ◽  
K. Meyer
Keyword(s):  
Beef Cattle ◽  
Weaning Weight

Genetic variation of the weaning weight of beef cattle as a function of accumulated heat stress

2015 ◽  
Vol 133 (2) ◽  
pp. 92-104 ◽  
Author(s):  
M.L. Santana ◽  
A.B. Bignardi ◽  
J.P. Eler ◽  
J.B.S. Ferraz
Keyword(s):  
Genetic Variation ◽  
Heat Stress ◽  
Beef Cattle ◽  
Weaning Weight

scholarly journals Factors affecting growth traits of beef cattle breeds raised inSlovakia

2011 ◽  
Vol 50 (No. 1) ◽  
pp. 14-21 ◽  
Author(s):  
E. Krupa ◽  
M. Oravcová ◽  
P. Polák ◽  
J. Huba ◽  
Z. Krupová
Keyword(s):  
Birth Weight ◽  
Beef Cattle ◽  
Least Squares ◽  
Linear Model ◽  
Growth Traits ◽  
General Linear Model ◽  
Weaning Weight ◽  
Factors Affecting ◽  
Sex Effect ◽  
Beef Cattle Breeds

Growth traits of purebred calves of six beef breeds (Aberdeen Angus &ndash; AA, Blonde d&rsquo;Aquitaine &ndash; BA, Charolais &ndash; CH,Hereford &ndash; HE, Limousine &ndash; LI and Beef Simmental &ndash; BS) born from 1998 to 2002 were analysed. Traits under study were birth weight (BW), weight at 120 days (W120), weight at 210 days &ndash; weaning weight (WW), weight at 365 days &ndash; yearling weight (YW) and average daily gains from birth to 120 days (ADG1), from birth to 210 days (ADG2), from birth to 365 days (ADG3), from 120 to 210 days (ADG4). General linear model with class effects of breed, dam&rsquo;s age at calving, sex, herd-year-season (HYS) and covariation of age at weighing was used for analyses. All effects significantly affected both weight and gain traits except for dam&rsquo;s age that was significant for BW, W120, YW and ADG3, and age at weighing that was significant for W120, WW, YW, ADG2, ADG3, ADG4. Estimated least squares means of growth traits were compared using Scheffe&rsquo;s multiple-range tests. Highest BW (40.57&nbsp;kg) and W120 (172.43 kg) were found for BA calves. BS calves had highest WW (260.30 kg), YW (424.07 kg), ADG1 (1&nbsp;154&nbsp;g), ADG2 (1 053 g), ADG3 (1 054 g) and ADG4 (1 098 g). Highest BW, YW, ADG3 and ADG4 were found for males-singles. Males-twins had highest W120, WW, ADG1 and ADG2. Calves descending from 5&ndash;7 years old dams had highest BW, W120, WW, ADG1, ADG2 and ADG4. The proportion of variability of growth traits explained by HYS effect (42.96&ndash;71.69%) was high, whereas proportions of variability explained by SEX effect (2.03&ndash;5.77%), age of dam (1.02&ndash;2.24%) and breed (1.05&ndash;2.21%) were low. Residuals accounted for 23.71 up to 53.79% of total variance. &nbsp;

scholarly journals Development of a genetic evaluation for hair shedding in American Angus cattle to improve thermotolerance

2020 ◽  
Vol 52 (1) ◽  
Author(s):  
Harly J. Durbin ◽  
Duc Lu ◽  
Helen Yampara-Iquise ◽  
Stephen P. Miller ◽  
Jared E. Decker
Keyword(s):  
Heat Stress ◽  
Beef Cattle ◽  
Tall Fescue ◽  
The United States ◽  
Genetic Evaluation ◽  
Functional Enrichment ◽  
Fescue Toxicosis ◽  
Weaning Weight ◽  
Angus Cattle ◽  
Genetic Evaluations

Abstract Background Heat stress and fescue toxicosis caused by ingesting tall fescue infected with the endophytic fungus Epichloë coenophiala represent two of the most prevalent stressors to beef cattle in the United States and cost the beef industry millions of dollars each year. The rate at which a beef cow sheds her winter coat early in the summer is an indicator of adaptation to heat and an economically relevant trait in temperate or subtropical parts of the world. Furthermore, research suggests that early-summer hair shedding may reflect tolerance to fescue toxicosis, since vasoconstriction induced by fescue toxicosis limits the ability of an animal to shed its winter coat. Both heat stress and fescue toxicosis reduce profitability partly via indirect maternal effects on calf weaning weight. Here, we developed parameters for routine genetic evaluation of hair shedding score in American Angus cattle, and identified genomic loci associated with variation in hair shedding score via genome-wide association analysis (GWAA). Results Hair shedding score was moderately heritable (h2 = 0.34 to 0.40), with different repeatability estimates between cattle grazing versus not grazing endophyte-infected tall fescue. Our results suggest modestly negative genetic and phenotypic correlations between a dam’s hair shedding score (lower score is earlier shedding) and the weaning weight of her calf, which is one metric of performance. Together, these results indicate that economic gains can be made by using hair shedding score breeding values to select for heat-tolerant cattle. GWAA identified 176 variants significant at FDR < 0.05. Functional enrichment analyses using genes that were located within 50 kb of these variants identified pathways involved in keratin formation, prolactin signalling, host-virus interaction, and other biological processes. Conclusions This work contributes to a continuing trend in the development of genetic evaluations for environmental adaptation. Our results will aid beef cattle producers in selecting more sustainable and climate-adapted cattle, as well as enable the development of similar routine genetic evaluations in other breeds.

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