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Reproductive performance in Holstein-Friesian cows in relation to genetic merit and level of feeding when grazing pasture

Published online by Cambridge University Press:  18 August 2016

W. J. Fulkerson ,
J. Wilkins ,
R. C. Dobos ,
G. M. Hough ,
M. E. Goddard  and
T. Davison
W. J. Fulkerson*
Affiliation:
University of Sydney, Camden, New South Wales 2570, Australia
J. Wilkins
Affiliation:
Agricultural Research Institute, Wagga Wagga, New South Wales 2650, Australia
R. C. Dobos
Affiliation:
NSW Agriculture, Armidale, New South Wales 2351, Australia
G. M. Hough
Affiliation:
Bunbury, Western Australia 62305, Australia
M. E. Goddard
Affiliation:
University of Melbourne, Victoria 3000, Australia
T. Davison
Affiliation:
Dairy Research and Development Corporation, Melbourne, Victoria 3000, Australia
*
†E-mail:billf@camden.usyd.edu.au
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Abstract

One hundred and eight Holstein-Friesian cows in six herds were run on six separate farmlets over a 5-year period from 1995 to 1999 at Wollongbar Agricultural Institute, on the subtropical north coast of New South Wales, Australia. Three of the herds comprised high genetic merit (HGM) cows — Australian breeding value (ABV) of +49·1 kg for milk fat (F) plus protein (Pr) and three herds comprised low genetic merit (LGM) cows-ABV of 2·3 kg. Within genetic merit groupings, one herd was given 0·34 t (l), one herd was given 0·84 t (m) and one herd 1·71 t (h), of concentrate per cow per lactation. Within each genetic merit group, cows were matched for milk yield and live weight, and over all groups for time of calving and age at the commencement of the study. The 30 paddocks within each farmlet were matched between farmlets for pasture type and pasture growth rate and soil fertility. Half the cows within each herd calved over a 3-month period in spring and the other half in autumn. Strict management criteria ensured that there was no bias towards particular treatment groups.

HGM cows were ‘open’ (days from calving to conception) for 8 days longer than the LGM cows (99 v. 91 days). The lHGM cows took 11 days longer to commence luteal phase activity and 21 days longer to first observed oestrus post calving than hLGM cows (P < 0·001), with the other groups being intermediate.

After 24 days of mating, 22% of lHGM cows were pregnant, and this was less than half of the rate of the best herd-mLGM. After 9 weeks of mating, the chances of an LGM cow being pregnant was 87% greater than an HGM cow. After 12 weeks of mating, 70% of lHGM cows were pregnant compared with a mean pregnancy rate of 87% for the LGM cows.

The number of cows treated for abnormal ovarian activity (anoestrus, cystic) was highest (P < 0·001) in the HGM herds given ‘l’ and ‘m’ levels of concentrate compared with the remaining herds (0·24 v. 0·12 treatments per cow mated, respectively).

There was a significant positive relationship between live-weight change from 4 weeks before, to the start of, the mating period and the chances of a cow being pregnant at 24 days (P < 0·05) and at 6 and 9 weeks after the commencement of mating.

There was a significant negative relationship (P < 0·001) between the change in daily F plus Pr yield, from the start to 4 weeks after mating began, and pregnancy rate at 9 weeks. The change in F plus Pr yield was +63 g/day for cows pregnant at nine weeks as opposed to +154 g/day for cows not pregnant.

The results of the present study indicate that the reproductive performance of HGM cows, with a mean of 61% North American (NA) genes, is lower than LGM cows (22% NA genes) under a predominantly pasture-based system of farming. The influence on reproduction was possibly due to genes favouring partitioning of energy to milk yield rather than body-condition maintenance in the HGM cows and when food intake was inadequate, then being more willing to use body reserves.

These reproductive problems may be reduced by more intensive reproductive management. However, such practices are costly and time consuming. Another approach may be to ensure that live-weight loss over the mating period is minimized by strategic supplementary feeding.

Keywords

concentratescowsgenetic meritHolstein-Friesianreproduction.
Type
Breeding and genetics
Information
Animal Science , Volume 73 , Issue 3 , December 2001 , pp. 397 - 406
Copyright
Copyright © British Society of Animal Science 2001

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