Evaluation of Hereford and first-cross cows on three pasture systems. I. Calf growth and reproductive performance of young cows

Barlow, R; Hearnshaw, H; Arthur, P. F.; Darnell, Ross

doi:10.1017/s0021859600065862

Cited by 18 publications

(14 citation statements)

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“…In previous experiments at the Grafton site, Barlow et al (1994) studied a variety of cross-breeding strategies, including Bos taurus · B. indicus breeds. Although the Hereford · Simmental and Hereford · Friesian crosses used by Barlow et al (1994) were not of the extreme type used in the Cafe et al (2006bCafe et al ( , 2009) and Greenwood et al (2006Greenwood et al ( , 2009 trials, they do provide an approximation of the mature cow size and the impact of the level of nutrition on the subsequent fertility of cows.…”

Section: Cow Reproductive Performancementioning

confidence: 99%

“…Although the Hereford · Simmental and Hereford · Friesian crosses used by Barlow et al (1994) were not of the extreme type used in the Cafe et al (2006bCafe et al ( , 2009) and Greenwood et al (2006Greenwood et al ( , 2009 trials, they do provide an approximation of the mature cow size and the impact of the level of nutrition on the subsequent fertility of cows. The Barlow et al (1994) results are summarised in Table 10. A comparison of the prejoining liveweights and associated condition scores of cows reported in Barlow et al (1994) with those measured in the present study suggests that the average values for the medium pasture-nutrition treatment of Barlow et al (1994) closely approximates the LL treatment reported for the present study, and the high pasture-nutrition treatment of Barlow et al (1994) most closely matches the HH treatment. Taking the range of average weaning rates reported by Barlow et al (1994) for the medium-and high-nutrition groups, it was therefore assumed that the weaning rates in the present study would take the values of 75% for LL and 85% for HH.…”

Section: Cow Reproductive Performancementioning

confidence: 99%

“…The Barlow et al (1994) results are summarised in Table 10. A comparison of the prejoining liveweights and associated condition scores of cows reported in Barlow et al (1994) with those measured in the present study suggests that the average values for the medium pasture-nutrition treatment of Barlow et al (1994) closely approximates the LL treatment reported for the present study, and the high pasture-nutrition treatment of Barlow et al (1994) most closely matches the HH treatment. Taking the range of average weaning rates reported by Barlow et al (1994) for the medium-and high-nutrition groups, it was therefore assumed that the weaning rates in the present study would take the values of 75% for LL and 85% for HH. Given the larger influence of preweaning nutrition treatment on the liveweight and condition score of cows (the HL cows having significantly lower condition score and liveweight at weaning than the LH cows), the HL group were assumed to have a weaning rate of 78% and LH 81%.…”

Section: Cow Reproductive Performancementioning

confidence: 99%

“…Hence, in the present paper a farm-level modelling system is described that allows an economic evaluation of experimental results of maternal nutritional systems and offspring performance reported by Greenwood et al (2006Greenwood et al ( , 2009 and Cafe et al (2006bCafe et al ( , 2009, and the economic outcomes of applying this system in two different ways are reported. The economic analysis also examines the implications of lower cow fertility and subsequent weaning rates that would be expected (Barlow et al 1994) to result from the varying nutritional treatments of cows reported in the study. Implications are then drawn for beef-cattle producers in the region where the study was undertaken.…”

Section: Introductionmentioning

confidence: 99%

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Economic effects of nutritional constraints early in life of cattle

et al. 2009

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Abstract. An experiment was conducted at the Grafton Agricultural Research Station on the northern coast of New South Wales whereby low and high pasture nutritional systems were imposed on a herd of Hereford cows during pregnancy and from birth to weaning in a factorial design. Offspring representing extremes of growth to birth and/or weaning were then selected for study of long-term consequences of growth early in life. Implications of the nutritional treatments of cows on subsequent weaning rates were also tested with data from previous studies. The extent to which these extreme maternal nutritional and offspring growth scenarios affected herd profitability was tested with the Beef-N-Omics decision support package. For the representative cattle enterprise modelled, gross margin per hectare ranged from $A114 to $A132. In all cases, the gross margin for those groups with fetal growth based on a higher level of nutrition exceeded that of their peers on a lower level of nutrition. It is more profitable for cows and calves to have access to a high standard of nutrition during pregnancy and up to weaning than for them to have access only to a poor standard of nutrition. Incorporating differential weaning rates following maternal nutritional treatments reduced gross margins per hectare by up to 30%. On average, a 1% reduction in weaning rate resulted in a 4.5% reduction in gross margin. Restricted cow-calf nutrition affects the future cow fertility, as well as the current calf progeny, economically.

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Section: Cow Reproductive Performancementioning

confidence: 99%

Section: Cow Reproductive Performancementioning

confidence: 99%

Section: Cow Reproductive Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Economic effects of nutritional constraints early in life of cattle

et al. 2009

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“…The growth of these cows as calves and as heifers up to 30 months of age have been reported by Barlow & O'Neill (1978, 1980 and Hearnshaw et al (1989), respectively. Their performance as young cows has been reported by Barlow et al (1994). The cows were of four breeds; purebred Hereford (H x H), first-cross Brahman x Hereford (B x H), Simmental x Hereford (SxH) and Friesian x Hereford (FxH).…”

mentioning

confidence: 99%

Evaluation of Hereford and first-cross cows on three pasture systems. II. Growth of Hereford and Brahman sired calves out of mature cows

et al. 1994

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SUMMARYThe preweaning growth of the progeny of mature cows grazing high, medium or low quality pasture was evaluated. The cows were 5–9 years of age at the beginning of the study and were either purebred Hereford (H x H), first-cross Brahman x Hereford (B x H), Simmental x Hereford (S x H) or Friesian x Hereford (F x H). Hereford and Brahman bulls were mated to these cows for three mating seasons commencing in 1982, at Grafton, New South Wales, Australia. Records on 634 calves born over three consecutive years were used.Most traits were subject to significant sire breed or dam breed effects or their interactions with one or more of the other main effects (pasture, year of birth of calf, cow age and sex of calf). The incidences of calving difficulty and stillbirths were exceptions. Stillbirths (mean of 3·8%) were not affected by any of the effects studied, while calving difficulty was affected only by sex of calf effect (males, 3·9%; females, 0·8%). The mean calving date of Brahman-sired calves was 11·4 days later (P < 0·05) than that of Hereford-sired calves. Differences between Brahman-sired and Hereford-sired calves for weaning weight were not significant for S x H (Brahman, 237 kg; Hereford, 232 kg) and FxH (Brahman, 238kg; Hereford, 238kg) dams. For HxH dams however, calves sired by Brahman were heavier at weaning (205 kg) than those sired by Hereford (193 kg) bulls, while for B x H dams the reverse was true (Brahman, 222 kg; Hereford, 231 kg). For calves with B x H dams average daily gain (ADG) was the same (957 g/day) for each sire breed, while for the other dam breeds, Brahman-sired calves had a higher ADG than Hereford-sired calves (862 v. 779, 1014 v. 946 and 1022 v. 950 g/day for H x H, S x H and FxH, respectively). Calves sired by Brahman bulls had > 90% eyelid pigmentation while Hereford-sired calves had 44–74%. On high quality pasture, the weaning weights and ADG of calves of F x H and S x H dams were higher than those of B x H and HxH dams. On medium quality pasture, weaning weight of calves of crossbred dams (B x H, S x H and FxH) were similar but higher than those of H x H dams. On low quality pasture, mean weaning weight of calves of B x H was higher than those of S x H and F x H dams, which in turn, were higher than that of H x H dams.

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