Reproductive Performance of Angus, Brahman, Charolais and Crossbred Dams

Peacock, F. M.; Koger, M.

doi:10.2527/jas1980.504689x

Cited by 17 publications

(21 citation statements)

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“…This superiority widely exceeds others obtained in crosses involving A: 0-127 with Hereford in New Zealand (Morris, Baker, Johnson, Carter and Hunter, 1987), 0-075 with Hereford in Nebraska (Cundiff et al, 1974); 0-087 with Brahman in Florida (Peacock and Koger, 1980). This superiority widely exceeds others obtained in crosses involving A: 0-127 with Hereford in New Zealand (Morris, Baker, Johnson, Carter and Hunter, 1987), 0-075 with Hereford in Nebraska (Cundiff et al, 1974); 0-087 with Brahman in Florida (Peacock and Koger, 1980).…”

Section: Calving and Weaning Ratesmentioning

confidence: 61%

Reproductive traits of Angus, Criollo and reciprocal crossbred females in the temperate area of Argentina

et al. 1995

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Reproductive performance of purebred Angus (A) and Criollo (C) cows and crossbred CA and AC cows inthe temperate area of Buenos Aires, Argentina, was assessed through the study of reproductive rates, calving date, first insemination date, number of inseminations and weight related variables. The herd was grazed on pastures all year round. Matings were by artificial insemination with visual oestrus detection, from October to December. Heifers first calving was at 3 years of age. All traits were analysed with general linear models including, as corresponded, fixed effects of dam and calf genetic groups, calving year and month, dam physiological status, calving age and first order interactions. Female genetic group adjusted means were used to estimate direct (g l ) and maternal (g M ) breed differences and heterosis (h l ) effects on reproductive traits. Weaning rate was mostly determined by oestrons detection rate. Due to the inhibitory effects of nursing on reproduction, female genetic group effects were significant for suckling cows only: mean oestrous detection rate was higher (P < 0-05) for crossbred cows (AC: 91-2 (s.e. 5-1) %; CA: 88-4 (s.e. 2-9) %) than for A (76-3 (s.e. 2-0) %) and C (49-9 (s.e. 3-3) %); direct breed effects favoured A (g lA -g' c = 26-4 (s.e. 3-7) %; P < 0-001) and h 1 was 26-7 (s.e. 3-4) % (P < 0-001). When only oestrous-detected cows were considered, direct breed effects were significant only for pregnancy rate fg' A -g' c = 8-5 (s.e. 4-4) %) whereas h 1 was significant for pregnancy (8-3 (s.e. 3-8) %), calving (9-3 (s.e. 4-1) %) and weaning (10-1 (s.e. 4-1) %) rates (P < 0-05). Criollo cows calved later than crossbred (-19 days) and A (-15 days) cows mainly due to longer post-partum anoestrous. For calving date, direct breed effects favoured A (g' A -g' c = 20-8 (s.e. 5-9) days; P <0-0-001) and h 1 was 11-4 (s.e. 2-8) days (P < 0-001). Low reproductive performance in C was not associated with live iveight at the beginning of mating. This genetic group was the latest in showing oestrous behaviour, even when not suckling. Number of inseminations was similar for the four genetic groups. These results sustain the principle of utilizing Fl Criollo-Angus cows to improve beef herd productivity, whereas they do not support the recommendation of using purebred Criollo females under this type of production system.

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Section: Calving and Weaning Ratesmentioning

confidence: 61%

Reproductive traits of Angus, Criollo and reciprocal crossbred females in the temperate area of Argentina

et al. 1995

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“…These values are much higher than those found in the present study in which no culling for fertility or other traits was practised, and the service seasons were also shorter than those reported by the authors. Turner, Farthing and Robertson, 1968;Peacock, Koger, Kirk, Hodges and Warnick, 1971;Peacock and Koger, 1980) in which the calving rate of Brahman cows was relatively high. This is in contrast to the findings of Vorster (1964) in which sanga and Bos taurus showed similar reproductive performance.…”

Section: Cow Productivitymentioning

confidence: 99%

Evaluation of beef breeds for rangeland weaner production in Zimbabwe 1. Productivity of purebred cows

Tawonezvi¹,

Ward²,

Trail³

et al. 1988

Anim. Sci.

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Purebred cows were evaluated for reproductive performance and live weight, and for pre-weaning growth and viability of crossbred progeny sired by unrelated breeds. The cows comprised three indigenous breeds, Mashona, Nkone and Tuli and four exotic breeds Africander, Brahman, Sussex and Charolais. Over 3 years, the mean calving rates % (s.e.) were 55-5 (3-0), 76-0 (3-8), 63-1 (4-5), 69-6 (3-5), 70-0 (3-8), 60-0 (4-3) and 67-0 (5-0) for Africander, Mashona, Nkone, Tuli, Brahman, Sussex and Charolais cows, respectively. Bos taurus and Brahman cows were heavier at parturition and at calf weaning than indigenous cows. Mashona cows were lightest at both stages. Calves of Bos taurus cows were heaviest at birth and those of Mashona lightest. Calves of Brahman cows had the most rapid growth rate and at weaning (240 days) weighed in kg (s.e.) 207 (3-1), compared with 184 (2-1), 172 (2-2), 187 (2-6), 184 (2-1), 178 (2-7) and 186 (2-9) for progeny of Africander, Mashona, Nkone, Tuli, Sussex and Charolais, respectively. Pre-weaning survival rates of the breeds were not significantly different but viability was higher in progeny of indigenous than exotic breeds. The productivity estimates combining calving rate, cow weight, calf weaning weight and pre-weaning viability demonstrated the superiority of indigenous breeds and the Brahman over Africander and Bos taurus breeds. t Present address: Grasslands Research Station, Private Bag 3701, Marondera, Zimbabwe.

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“…Advantages of Bos indicus germplasm relative to Bos taurus are greater heat tolerance (Carvalho et al, 1995;Hammond et al, 1996), greater resistance to parasites (Fourie and Kok, 1995;Bock et al, 1997) and viral infections (Jimenez et al, 1995;Soeharsono et al, 1995), and improved maternal calving ease (Olson et al, 1993). Bos indicus × Bos taurus crosses express greater heterosis effects for direct and maternal traits (Peacock et al, 1982) and neonatal survival (Peacock and Koger, 1980) than do crosses within species. Disadvantages of Bos indicus germplasm are reduced meat tenderness (Koch et al, 1982;Wheeler et al, 1994), reduced cold tolerance (Josey et al, 1987;Godfrey et al, 1991;Carstens et al, 1997), decreased neonatal survival in temperate climates (Reynolds et al, 1980), delayed puberty (Gregory et al, 1979a;Chenoweth et al, 1996), and decreased paternal calving ease (Gregory et al, 1979b).…”

Section: Introductionmentioning

confidence: 99%

A region on bovine chromosome 15 influences beef longissimus tenderness in steers.

Keele

Shackelford

Kappes

et al. 1999

Journal of Animal Science

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A genome scan was conducted using 196 microsatellite DNA markers spanning 29 autosomal bovine chromosomes and Warner-Bratzler shear force collected at d 2 and 14 postmortem on steaks from the longissimus muscle of 294 progeny from one Brahman x Hereford bull mated to Bos taurus cows to identify QTL for beef tenderness. One QTL was identified and located 28 cM (95% confidence interval is 17 to 40 cM) from the most centromeric marker on BTA15. The QTL interacted significantly with slaughter group. The difference in shear force of steaks aged 14 d postmortem between progeny with the Brahman paternally inherited allele vs those with Hereford was 1.19 phenotypic standard deviations (explained 26% of phenotypic variance) for one slaughter group and was not significant for three other slaughter groups. Apparently, unknown environmental factors present for three of the four slaughter groups were capable of masking the effect of this QTL. The sensitivity of the QTL effect to environmental factors may complicate utilization of markers for genetic improvement. Future research to elucidate the cause of the QTL x slaughter group interaction may lead to improved strategies for controlling variation in meat tenderness via marker-assisted selection, postmortem processing, or live animal management.

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Reproductive Performance of Angus, Brahman, Charolais and Crossbred Dams

Cited by 17 publications

References 0 publications

Reproductive traits of Angus, Criollo and reciprocal crossbred females in the temperate area of Argentina

Reproductive traits of Angus, Criollo and reciprocal crossbred females in the temperate area of Argentina

Evaluation of beef breeds for rangeland weaner production in Zimbabwe 1. Productivity of purebred cows

A region on bovine chromosome 15 influences beef longissimus tenderness in steers.

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