Rearing of dairy cattle 8. Relationships of dietary energy intake, changes in live weight, body condition and fertility

Baishya, N.; Morant, S. V.; Pope, G. S.; Leaver, J. D.

doi:10.1017/s0003356100000489

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…The percentage conception rate varied between 12 and 33% of animals given the Mo-supplemented diets compared with 58-80% for animals on the other diets. The latter figure was similar to that reported by other authors after the use of prostaglandin synchronization (Leaver, 1977;Baishya et al 1982;Mclntosh, Lewis & Hammond, 1984). The data also suggest that the effect of Mo on conception may be quite rapid, since there was a trend towards a lower conception rate within 8 weeks of a change to a Mo-containing diet in Expt la in cows which were already low in Cu status.…”

Section: Fertilitysupporting

confidence: 91%

The effect of dietary molybdenum and iron on copper status, puberty, fertility and oestrous cycles in cattle

Phillippo¹,

Humphries²,

Atkinson³

et al. 1987

J. Agric. Sci.

101

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Two experiments were conducted to examine the effects of supplementation of a control diet of barley grain and barley straw containing 4 mg copper (Cu)/kg dry matter (D.M.) either with 5 mg molybdenum (Mo)/kg D.M. or with 500 or 800 mg iron (Fe)/kg D.M. on puberty, fertility and oestrous cycles of cattle. Puberty occurred normally in control, Fesupplemented and control animals on a restricted intake whereas it was delayed by 12 and 8 weeks respectively by Mo supplementation. This effect of Mo was not due to the low Cu status since this was equally low in the Fe-supplemented animals, nor was it due to the reduced growth rate since puberty occurred normally in control animals that had a similar live-weight gain. A significant reduction in the pulsatile release of luteinizing hormone was observed within 11 weeks of the Mo supplementation and before any of the other clinical signs were evident, suggesting that Mo may be affecting puberty by altering the release of luteinizing hormone either directly or indirectly.Mo supplementation significantly reduced the percentage conception rate to 12-33% compared with 57-80% in control and Fe-supplemented animals. This effect was not dependent on the rate of live-weight gain which was standardized across the different treatments at approximately 0 -6 kg/day. Within 12 weeks of the replacement of dietary Fe by Mo a lower conception rate occurred; replacing dietary Mo by Fe led to a normal conception rate within 12 weeks without any accompanying changes in Cu status or in the rate of live-weight gain. The plasma Mo concentrations, however, changed significantly during these alterations in dietary supplementation. The pre-ovulatory peak height of luteinizing hormone was significantly lower in animals on the Mo-supplemented diet compared with control and Fe-supplemented animals, but the administration of LHRH did not alter the conception rate.More Mo-supplemented animals failed to ovulate following prostaglandin induced synchronization in comparison with the other treatments, and by the 84th week a significantly greater number of Mo-supplemented animals (12/18) had become anoestrous compared with the other groups (2/30). Cu repletion of these anoestrous Mo animals for a period of 20 weeks did not result in resumption of normal oestrous cycles, but ovulation and oestrus were induced by progesterone and LHRH treatment. Results in the latter part of the study indicated that Mo caused superovulation.These data show that Mo supplementation delayed the onset of puberty, decreased the conception rate and caused anovulation and anoestrus in cattle without accompanying changes in Cu status or in live-weight gain. It is suggested that these effects of Mo are associated with a decreased release of luteinizing hormone that might be due to an altered ovarian steroid secretion.

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Section: Fertilitysupporting

confidence: 91%

The effect of dietary molybdenum and iron on copper status, puberty, fertility and oestrous cycles in cattle

Phillippo¹,

Humphries²,

Atkinson³

et al. 1987

J. Agric. Sci.

101

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“…The relationship between milk yield and fertility of cows has been correlated with body weight, body weight changes and condition score (Baishya et al, 1982;Ducker and Morant, 1984;Ducker et al, 1985;Richards et al, 1986). In order to improve cattle productivity it is useful to start by quantifying the extent to which cattle are affected by nutrition, disease or other environmental factors, especially when large fluctuations in the quantity and quality of forage occur, as they do in seasonally dry tropical and sub-tropical areas.…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in nutritional status and reproductive performance of Zebu cows kept under a traditional agro-pastoral system in Tanzania

Kanuya

Matiko

Nkya

et al. 2006

Trop Anim Health Prod

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The objectives of this study were to assess changes in nutritional status/body condition score, percentage pregnancy and calving rate in Zebu cows and to establish the relationship between body condition score loss and postpartum interval to resumption of ovarian activity. A total of 198 cows and postpubertal heifers of the Tanzanian Shorthorn Zebu kept under a traditional management system were randomly selected from 200 smallholder herds. Factors investigated during bi-weekly visits include body condition score (BCS), heart-girth circumference, milk yield and reproductive status of the animals, pregnancy/nonpregnancy and cyclicity/non-cyclicity. Local weather conditions and dates of occurrence of other reproductive events such as calving were also recorded. Calvings occurred all year round but with a strong seasonal distribution characterized by annual peaks observed between April and July. The annual calving pattern was closely related to rainfall, with peak precipitation occurring a few months before peak calving. The overall percentage pregnancy varied from 30% to 50% throughout the year. Postpartum cows exhibited minimum mean BCS and heart-girth circumference 12-14 weeks after calving, and cows with BCS loss >1 point exhibited the longest time interval from calving to onset of ovarian activity.

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“…Leaver (1977) presented results from individually-fed heifers that suggested an interaction between body condition and level of nutrition in relation to pregnancy rate. Baishya, Morant, Pope and Leaver (1982) have found that heifers individually fed to lose weight at insemination (0-2 kg/day) had lower pregnancy rates than heifers gaining weight at that time (0-4 kg/day). These results were not statistically significant.…”

Section: Introductionmentioning

confidence: 99%

“…

ABSTRACT

One hundred and sixty Friesian heifers were allocated to two groups 8 or 9 weeks before artificial insemination and group-fed to gain live weight at 0-8 or 0-3 kg/day.

…”

mentioning

confidence: 99%

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The effect of change and level of nutrition on the reproductive performance of group-fed dairy heifers

Ducker¹,

Yarrow²,

Morant³

1982

Anim. Sci.

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Link to this article: http://journals.cambridge.org/abstract_S0003356100000684How to cite this article: M. J. Ducker, N. Yarrow and S. V. Morant (1982). The effect of change and level of nutrition on the reproductive performance of group-fed dairy heifers. ABSTRACTOne hundred and sixty Friesian heifers were allocated to two groups 8 or 9 weeks before artificial insemination and group-fed to gain live weight at 0-8 or 0-3 kg/day. Half the heifers of each group were moved to the other group 2 weeks before first insemination. All heifers received two intramuscular injections of prostaglandin (cloprostenol) 11 days apart, followed by inseminations at 72 and 96 h after the second injection.The feeding regimes applied did not significantly affect the fertility of groups of heifers as measured by pregnancy rates to fixed-time or all inseminations. There were significant differences between pregnant and nonpregnant heifers within groups where changes in feeding levels were imposed (P <0001), the overall pregnancy rates were not significantly different.

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Rearing of dairy cattle 8. Relationships of dietary energy intake, changes in live weight, body condition and fertility

Cited by 11 publications

References 13 publications

The effect of dietary molybdenum and iron on copper status, puberty, fertility and oestrous cycles in cattle

The effect of dietary molybdenum and iron on copper status, puberty, fertility and oestrous cycles in cattle

Seasonal changes in nutritional status and reproductive performance of Zebu cows kept under a traditional agro-pastoral system in Tanzania

The effect of change and level of nutrition on the reproductive performance of group-fed dairy heifers

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