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Effect of calcium salts of fatty acids and calcium salt of methionine hydroxy analogue on reproductive responses and milk production in Holstein-Friesian cows

Published online by Cambridge University Press:  18 August 2016

J. Fahey ,
J.F. Mee ,
D. O’Callaghan  and
J.J. Murphy
J. Fahey
Affiliation:
Teagasc, Dairy Production Department, Moorepark Production Research Centre, Fermoy, Co. Cork, Ireland Department of Animal Husbandry and Production, Faculty of Veterinary Medicine, University College Dublin, Ireland
J.F. Mee*
Affiliation:
Teagasc, Dairy Production Department, Moorepark Production Research Centre, Fermoy, Co. Cork, Ireland
D. O’Callaghan
Affiliation:
Department of Animal Husbandry and Production, Faculty of Veterinary Medicine, University College Dublin, Ireland
J.J. Murphy
Affiliation:
Teagasc, Dairy Production Department, Moorepark Production Research Centre, Fermoy, Co. Cork, Ireland
*
†E-mail:jmee@moorepark.teagasc.ie
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Abstract

The effects of a dietary supplement with calcium salts of fatty acids and methionine hydroxy analogue on reproductive performance, blood metabolites, milk production, milk composition, body weight and body condition score was studied in lactating dairy cows. Autumn-calving, Holstein-Friesian cows (no. = 162) were assigned 1 week post calving to one of two diets: (1) unsupplemented maize-silage-based complete diet while housed before turn-out to perennial ryegrass pasture and (2) the same diet with 400 g per cow per day of a supplement with calcium salts of long-chain fatty acids and methionine hydroxy analogue (Megalac Plus, Volac Ltd). Eleven cows were removed from the study following randomization for reasons not related to the experiment leaving 151 cows on dietary treatments. The diets were offered until the end of the 18-week breeding period. Cows receiving supplement had higher milk yield and milk lactose production and lower milk protein and milk fat proportion (P < 0·05). Body weight and body condition scores were not different between treatments in the first 20 weeks of lactation (P > 0·05). Overall reproductive performance was not different between dietary treatments (P > 0·05). However, first lactation animals (no. = 33) receiving the dietary lipid and methionine supplement tended to have increased conception rates to first and second service (P < 0·09) which resulted in a shorter calving-to-conception interval in those animals (P < 0·06). Services per conception (P < 0·08), services per cow served (P < 0·05) and services per conception for pregnant cows (P < 0·05) in first lactation animals was reduced in the supplemented group. Although plasma cholesterol concentrations were increased following lipid and methionine supplementation (P < 0·01), plasma progesterone concentrations on day 5 and day 8 after artificial insemination were not different between dietary treatments (P > 0·05). In conclusion, a dietary supplement of calcium salts of fatty acids and methionine hydroxy analogue increased milk yield, milk lactose production and blood cholesterol concentration but did not improve reproductive performance, except in first lactation cows.

Keywords

cowsdietary fatmethioninemilk productionreproductive performance
Type
Reproduction
Information
Animal Science , Volume 74 , Issue 1 , February 2002 , pp. 145 - 154
Copyright
Copyright © British Society of Animal Science 2002

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