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The effects of levels of concentrate offered and inclusion of maize gluten or fish meal in the concentrate on reproductive performance and blood parameters of dairy cows

Published online by Cambridge University Press:  02 September 2010

J. D. Armstrong ,
E. A. Goodall ,
F. J. Gordon ,
D. A. Rice  and
W. J. McCaughey
J. D. Armstrong
Affiliation:
Veterinary Research Laboratories, Stormont, Belfast BT4 3SD
E. A. Goodall
Affiliation:
Biometrics Division, Agriculture and Food Science Centre, Newforge Lane, Belfast BT9 5PX
F. J. Gordon
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR
D. A. Rice
Affiliation:
Veterinary Research Laboratories, Stormont, Belfast BT4 3SD
W. J. McCaughey
Affiliation:
Veterinary Research Laboratories, Stormont, Belfast BT4 3SD
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Abstract

Five randomized-block experiments were carried out over 2 years using British Friesian cows managed as three separate herds. The effects of offering cows different levels of concentrates, ranging from 0·8 to 7·2 kg/day, in addition to grass silage ad libitum during the winter period on reproductive performance was investigated. The effects of substituting 4 kg/day maize gluten, or 0·8 kg/day fish meal, for part or all of the standard concentrate were also examined.

Neither level of concentrates nor the inclusion of maize-gluten meal significantly affected reproductive performance even where milk production and quality was considerably influenced. The inclusion of fish meal improved conception rates to all services (0·64 v. 0·44; P < 0·05) and reduced the number of services required per conception (1·62 v. 2·31; P < 0·01).

Plasma urea levels were raised consistently by the feeding of fish meal and, with the exception of weeks 2 and 6 of lactation, by the feeding of higher levels of concentrates. From the 6th week of lactation levels of beta-hydroxybutyrate (BHB) in the blood were significantly higher in the group of cows receiving the highest level of concentrates. The BHB level at week 6 was correlated with the number of services required per conception.

A number of relationships between production factors and fertility are also presented.

Keywords

blood compositionconcentratesdairy cowsreproductive performance
Type
Research Article
Information
Animal Production , Volume 50 , Issue 1 , February 1990 , pp. 1 - 10
Copyright
Copyright © British Society of Animal Science 1990

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