The effect of interaction of ewe and lamb genotype on milk production of ewes and on <i>growth of lambs to weaning</i>

Doney, J. M.; Peart, Jason Nigel John; Smith, Wayne

doi:10.1017/s0003356100040563

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…This evidence suggests that males may be receiving more milk from their mothers. Lamb mass at weaning has proved to be a good index of the amount of milk consumed, irrespective of sex (BURRIS & BAUGUS, 1955;RICORDEAU & BOCCARD, 1961;GARDNER et al, 1964;DONEY et al, 1981;PERA BLANCO, 1985a). PERA BLANCO (1985a) found that Spanish merino ewes nursing male lambs produced more milk than ewes nursing female lambs.…”

Section: Consequentlymentioning

confidence: 99%

Sex-Biased Parent-Offspring Conflict

Redondo

Gomendio

Medina

1992

Behav

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In species showing sexual dimorphism, parents may obtain different fitness returns per unit of parental expenditure from sons and daughters. Under these circumstances, parents are expected to invest extra resources in offspring of the most profitable sex. However, it is unclear whether sex-biased expenditure is the result of selection acting on parents, their offspring, or both. Current parent-offspring conflict theory is used to investigate whether sex biases in parental expenditure should be accompanied by sex biases in parent-offspring conflict. It is suggested that, in general, greater conflict should be expected between parents and offspring of the favoured sex. Specifically, greater conflict is predicted among mother-son dyads than among mother-daughter dyads in most polygynous birds and mammals. Data on domestic sheep, as well as empirical evidence available for other species (mainly ungulates), lends support to the prediction. The prediction is further extended to cercopithecine primates, a group which lacks clear sex-biases in parental investment. In this case, differences in fitness returns per unit of parental expenditure between the daughters of dominant and subordinate mothers are positively related to differences in the extent of mother-daughter conflict. The results from this study highlight the important role that selective pressures acting on the offspring phenotype may have played in the evolution of sex-biased patterns of parental investment.

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Section: Consequentlymentioning

confidence: 99%

Sex-Biased Parent-Offspring Conflict

Redondo

Gomendio

Medina

1992

Behav

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“…These were balanced across treatments during the allocation of animals. In general in early lactation, larger lambs will obtain more milk by stimulating yield (Doney, Peart and Smith, 1981). The comparisons by Gallo and Davies (1988) of ewes rearing twins or triplets showed only small differences in milk yield at day 20 of lactation (4-1 v. 4-3 kg/day) and day 30 (3-7 v. 41 kg/day respectively).…”

Section: Number Of Foetuses Carried In Pregnancymentioning

confidence: 94%

The effect of concentrate level on the intakes of silages or hays by ewes in the 1st month of lactation

Orr

Treacher

1994

Anim. Sci.

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In three experiments, four grass silages and four grass hays were offered ad libitum to a total of 164 Finn Dorset ewes rearing twins in the 1st month of lactation. In addition, one of three constant daily levels (300, 650 or 1000 g fresh weight per ewe) of a barley-based concentrate was offered. In the first experiment, replacement rate of silage with in vitro organic matter digestibility (OMD) of 0-65 was less than for hay , at -0-09 v. -0-62 g forage OM per g concentrates OM. Consequently, lamb growth rate was greater and ewe weight loss was less with increased concentrate level for the silage than for the hay. In the second experiment, the replacement rates of three silages were not significantly different (mean -0-29) and, once again, increased concentrate level gave significantly better ewe and lamb performance. Finally, the replacement rates for three hays were also not significantly different (mean -0-30). Equations are presented to predict the intakes of hays and silages by ewes in early lactation.

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“…Only in the final period of lactation, from 9 weeks to weaning, did lamb growth rate differ significantly between sward height treatments. This was a period when there was less difference in sward height between treatments, it is also a period when lamb growth could be expected to be affected by variation in herbage intake as milk declines (Doney et al, 1981). In general, ewes across all treatments lost live weight during this period, suggesting that milk yield was being supported by the catabolism of body tissue.…”

Section: Ewe and Lamb Performance During Lactationmentioning

confidence: 98%

The implications of controlling grazed sward height for the operation and productivity of upland sheep systems in the UK. 1. Effects of two annual stocking rates in combination with two sward height profiles

Maxwell¹,

Sibbald²,

Dalziel³

et al. 1994

Grass and Forage Science

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The consequences of controlling sward height at two levels, around 5 cm (HS) and around 3·5 cm (LS), during spring and summer by adjusting weekly the proportion of the areas grazed in response to changes in rate of herbage production and utilizing the surplus pasture areas to conserve winter fodder were studied over three complete years for Greyface ewes with their lambs at 15ha−1 (SR15) and 10ha−1 (SR10). The rules used to control grazed sward height resulted in acceptable sward height control in three of four treatments and, by providing supplementary feed when sward height was below target, gave rise to similar levels of individual animal performance. Total output of lamb weaned was greater for the SR15 than for the SR10 flocks (607 vs 477 kg live weight ha−1; P<0·001). Amounts of winter fodder produced were less for the SR15 than for the SR10 flocks [39 vs 213kg dry matter (DM) per ewe; P < 0·001]. Significantly more supplementary feed (10·0 vs 4·4kg DM per ewe; P < 0·01) and hay (13·7 vs 4·0kg DM per ewe; P7lt;0·05) were offered around mating to SR15 flocks than to SR10 flocks. It is concluded that, provided that sward height can be controlled between 3·5 and 5·0cm during the spring and summer and that supplementation is offered when the grazed sward is below 3·5 cm, flock performance will fall within acceptable and predictable limits.

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The effect of interaction of ewe and lamb genotype on milk production of ewes and on growth of lambs to weaning

Cited by 16 publications

References 13 publications

Sex-Biased Parent-Offspring Conflict

Sex-Biased Parent-Offspring Conflict

The effect of concentrate level on the intakes of silages or hays by ewes in the 1st month of lactation

The implications of controlling grazed sward height for the operation and productivity of upland sheep systems in the UK. 1. Effects of two annual stocking rates in combination with two sward height profiles

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