The metabolisable energy requirement for maintenance and the efficiency of use of metabolisable energy for lactation and tissue gain in dairy cows offered a straw/concentrate ration

Data from a series of 36 complete energy balance trials (determined by indirect calorimetry) with eight high genetic merit lactating Holstein Friesian cows offered a straw/concentrate ration (0.18:0.82 dry matter basis) were analysed by a range of regression techniques to determine the metabolisable...

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Bibliographic Details
Published in:Livestock production science 1999-08, Vol.61 (1), p.23-31
Main Authors: Kirkland, R.M, Gordon, F.J
Format: Article
Language:English
Subjects:
BALANCE DE ENERGIA
BASAL METABOLISM
BILAN ENERGETIQUE
Body condition
CALORIMETRIA
CALORIMETRIE
CALORIMETRY
Dairy cow
DAIRY COWS
ENERGY BALANCE
ENERGY MANAGEMENT
ENERGY METABOLISM
Energy utilisation
GENOTIPOS
GENOTYPE
GENOTYPES
GESTION DE LA ENERGIA
GESTION ENERGETIQUE
LACTACION
LACTATION
METABOLISME BASAL
METABOLISME ENERGETIQUE
METABOLISMO BASAL
METABOLISMO ENERGETICO
VACAS LECHERAS
VACHE LAITIERE
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Summary:Data from a series of 36 complete energy balance trials (determined by indirect calorimetry) with eight high genetic merit lactating Holstein Friesian cows offered a straw/concentrate ration (0.18:0.82 dry matter basis) were analysed by a range of regression techniques to determine the metabolisable energy (ME) required for maintenance (ME m), and the efficiencies of ME use for lactation ( k l) and concomitant tissue gain ( k g). In the data set, milk yield ranged from 1.0 to 37.2 kg/day (s.d. 10.56), with this achieved by stage of lactation, plane of nutrition and drying off two quarters of all animals. Mean ME m was determined as 0.61 MJ/kg 0.75 per day (range 0.60–0.62) which was proportionately 0.27 above the value predicted from Agricultural and Food Research Council ( AFRC, 1990) (0.48 MJ/kg 0.75). It is suggested that ME m is influenced by animal genotype or body condition, which can both reflect differences in fat and protein contents of the body. The mean k l value produced was 0.59, which is above that (0.51) calculated from the relationship k l= E l(0)/ME p when the latter is calculated using the ME m predicted from AFRC (1990). The mean derived value of k g, 0.86, has limited biological meaning considering the small portion of total energy use on which the estimate is based.
ISSN:0301-6226
1872-6070
DOI:10.1016/S0301-6226(99)00046-9