Evaluation of beef breeds for rangeland weaner production in Zimbabwe 2. Productivity of crossbred cows and heterosis estimates

Tawonezvi, H.P.R.; Ward, H.K.; Trail, J.C.M.; Light, D.E.

doi:10.1017/s0003356100003494

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…The high positive Afrikaner maternal direct effect contradicts reports that seem to indicate that Sanga and Zebu type dams restrict the BW of their calves (Roberson et al, 1986;Comerford et al, 1987;Tawonezvi et al, 1988;Scholtz et al, 1990;Van Zyl et al, 1992;Franke, 1994), even when mated to late maturing Bos taurus sires with a positive additive effect on BW (Alenda et al, 1980) by way of a large negative maternal effect (Roberson et al, 1986).…”

Section: Resultsmentioning

confidence: 63%

Estimates of crossbreeding parameters in a multibreed beef cattle crossbreeding project

Skrypzeck¹,

Schoeman²,

Jordaan³

et al. 2000

SA J. An. Sci.

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Data from purebred and crossbred cattle, consisting of the Afrikaner (A), Simmentaler (S) and Hereford (H) breeds managed in a relatively intensive but high stocking rate environment, were analysed to estimate breed direct effects, individual heterotic effects, breed maternal and maternal heterotic effects for birth weight (BW) and weaning weight (WW). Simmentaler breed direct effects, expressed as deviation from the general mean, were positive (P ≤ 0.01) for both traits. Hereford and Afrikaner breed direct effects were negative (P ≤ 0.01) for both traits while the Afrikaner breed direct effects exceeded those of the Hereford. Afrikaner direct maternal effects were positive (P ≤ 0.01) for both traits. The Hereford direct maternal effect was negative (P ≤ 0.05) (-2.9%) for WW. Simmentaler maternal effect was negative (P ≤ 0.01 ) for BW but non-significant (P ≥ 0.05) for WW. Individual heterotic effects for BW were significant (P ≤ 0.01) in H x S (3.5%) and S x A (11.0%) only. Individual heterotic effects were positive (P ≤ 0.01) for WW, with that of the H x A (9.8%) and S x A (6.7%) crosses exceeding the S x H (3.1%) cross. Maternal heterotic effects were non-significant (P ≥ 0.05) for both BW and WW .

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Section: Resultsmentioning

confidence: 63%

Estimates of crossbreeding parameters in a multibreed beef cattle crossbreeding project

Skrypzeck¹,

Schoeman²,

Jordaan³

et al. 2000

SA J. An. Sci.

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“…The effect of sire breed of calf is reported by Tawonezvi et al (1988). The effect of sire breed of calf is reported by Tawonezvi et al (1988).…”

Section: Resultsmentioning

confidence: 97%

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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“…Although results of the present study indicate that Landim is a productive breed by its own merit, more information is needed about strategies to improve their contribution to farm productivity, either by selection or by crossing with other breeds. For example, the poorer productivity of Africander germplasm was also detected in crossbred offspring in Zimbabwe (Tawonezvi et al, 1988b). Crossbreeding of Sanga breeds with European or specialized tropical breeds to optimally combine the adaptability of local breeds (e.g., reproductive rate, disease resistance) with the greater beef or milk potentials of other breeds is acknowledged as a rational way to increase productivity in difficult environments (Ansell, 1985).…”

Section: Discussionmentioning

confidence: 99%

Comparison of Landim and Africander cattle in southern Mozambique: II. Female fertility, reproduction, and beef offtake.

Carvalheira

Blake

Pollak

et al. 1995

Journal of Animal Science

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Fertility and reproductive performance of Landim and Africander females were compared using data collected from 1968 to 1981 at the Chobela Research Station in Mozambique. Breeds were managed together and grouped by age and sex, except when separated for breeding. Traits were relative fertility (probability of fertile females calving from the first breeding season), age at first calving, first calving interval, and subsequent calving intervals. calving rates were tested by x2 procedures with equal expected frequencies in each subclass. The statistical model included breed, the random effect of sire within breed, year-season of birth or calving, and calving group within breed. Landim survivors were more fertile (P < .05) than the Africander ones throughout their recorded lifetimes. Landim females were 1.32 +/- .21 mo (or 3%) younger at first calving and had a 48 +/- 12 d (or 11%) shorter interval between first and second calving than the Africander average of 473 d. When reproductive and growth information were combined to compute an annual index of beef offtake expressed as 18-mo calf yield per unit of dam's weight at first calving, Landim cows annually yielded 30% more calf weight (P < .001) than Africander cows per kilogram of their own body maintenance despite lighter body weights at 18 mo. Superior fertility of Landim females led to greater beef offtake from higher calving rates. Greater fertility and relatively less feed to maintain the reproducing herd are probable mechanisms for a population to adapt to nutrient-limiting environments such as the one in southern Mozambique.

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Evaluation of beef breeds for rangeland weaner production in Zimbabwe 2. Productivity of crossbred cows and heterosis estimates

Cited by 7 publications

References 8 publications

Estimates of crossbreeding parameters in a multibreed beef cattle crossbreeding project

Estimates of crossbreeding parameters in a multibreed beef cattle crossbreeding project

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

Comparison of Landim and Africander cattle in southern Mozambique: II. Female fertility, reproduction, and beef offtake.

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