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Effect of offering dairy cows diets differing in phosphorus concentration over four successive lactations: 2. Health, fertility, bone phosphorus reserves and nutrient utilisation

Published online by Cambridge University Press:  16 November 2009

C. P. Ferris ,
M. A. McCoy ,
D. C. Patterson  and
D. J. Kilpatrick
C. P. Ferris*
Affiliation:
Agri-Food and Biosciences Institute, Agriculture Branch, Large Park, Hillsborough, Co. Down BT26 6DR, UK
M. A. McCoy
Affiliation:
Agri-Food and Biosciences Institute, Veterinary Science Division, Stoney Road, Belfast BT4 3SD, UK
D. C. Patterson
Affiliation:
Agri-Food and Biosciences Institute, Agriculture Branch, Large Park, Hillsborough, Co. Down BT26 6DR, UK
D. J. Kilpatrick
Affiliation:
Agri-Food and Biosciences Institute, Biometrics, Newforge Lane, Belfast BT9 5PX, UK
*
†E-mail: conrad.ferris@afbini.gov.uk
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Abstract

This experiment examined the long-term effects of offering diets containing low levels of dietary phosphorus (P) on dairy cow health, fertility and bone composition, and the effect of dietary P level on nutrient utilisation. One hundred winter-calving Holstein–Friesian dairy cows were offered diets containing either ‘high’ or ‘low’ levels of dietary P over a 4-year period. Rations offered during the winter included grass silage, maize silage (70 : 30 dry matter (DM) basis, approximately) and concentrates (10.0 to 12.0 kg/cow per day). During the summer periods in years 1 and 2, half of the cows grazed both day and night, while the remaining cows grazed by day, and were housed by night and offered grass silage. During years 3 and 4, all cows grazed both day and night during the summer period. Concentrate feed levels during the summer periods were 3.0 to 4.0 kg/cow per day. Different dietary P levels were achieved by offering concentrates containing either high or low P levels during the winter period (approximately 7.0 or 4.4 g P/kg DM, respectively) and during the summer period (approximately 6.8 or 3.6 g P/kg DM, respectively). Total ration P levels averaged 4.9 and 3.6 g P/kg DM for the high and low P winter diets, respectively, and 4.2 and 3.6 g P/kg DM for the high and low P summer diets, respectively. A total of 95, 70, 50 and 22 cows completed each of lactations from 1 to 4, respectively. Neither the incidence of lameness or mastitis, or milk somatic cell count, were affected by dietary P level (P > 0.05), while none of the fertility parameters recorded in any of lactations from 1 to 4 was affected by the dietary P level (P > 0.05). Dietary P level had no effect on the specific gravity, ash or calcium content of rib cortical bone cores (n = 78 cows), while the P content of cortical bone (g/kg fresh, g/kg DM and mg/ml fresh bone) was lower with cows offered low P diets (P < 0.05). Dietary P level had no significant effect on the digestibility of either the DM, nitrogen, energy or acid detergent fibre fraction of the diet (P > 0.05), while faecal P excretions were reduced by a mean of 27 g/cow per day with cows offered the low P diets during the winter period. The results of this study indicate that dietary P levels can be reduced to proportionately 0.8 (approximately) of current UK feeding standards (Agricultural and Food Research Council, 1991), with no detrimental effect on dairy cow health or fertility, while having only minor effects on bone composition.

Keywords

dairy cowsphosphorusfertilitybonenutrient utilisation
Type
Full Paper
Information
animal , Volume 4 , Issue 4 , April 2010 , pp. 560 - 571
Copyright
Copyright © The Animal Consortium 2009

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