Effects of pasture allowance on milk production of dairy cows offered increasing amounts of partial mixed rations in spring
M. J. Auldist A B , M. M. Wright A , L. C. Marett A , J. L. Jacobs A and W. J. Wales AA Agriculture Research Victoria, Department of Economic Development, Jobs, Transport and Resources, Ellinbank, Vic. 3821, Australia.
B Corresponding author. Email: Martin.Auldist@ecodev.vic.gov.au
Animal Production Science 57(7) 1305-1310 https://doi.org/10.1071/AN16544
Submitted: 7 August 2016 Accepted: 8 March 2017 Published: 27 April 2017
Abstract
Milk production was measured in Holstein–Friesian cows offered low, medium or high allowances of ryegrass pasture (15, 25 or 40 kg DM/cow.day to ground level) and receiving different amounts of supplement (6, 10, 12 or 14 kg DM/cow.day) as a partial mixed ration (PMR). The 27-day experiment was conducted in spring when cows were 45 ± 17.3 days in milk (mean ± s.d.). Two groups of six cows received each of the 12 combinations of pasture allowance and PMR amount. The PMR comprised wheat grain (38%, DM basis), maize grain (18%), lucerne hay (22%) and canola meal (22%). When 6 kg DM PMR/cow.day was offered, cows grazing the low allowance produced less milk and energy-corrected milk than did cows grazing the medium and high allowances. There was no effect of pasture allowance on production of milk or energy-corrected milk at any other amount of PMR offered. When cows were offered 14 kg DM PMR/cow.day, milk fat concentrations were lower for cows grazing the high pasture allowance than for cows grazing the medium allowance. There were no differences in milk fat concentrations between cows grazing the different pasture allowances at any other amount of PMR offered. When cows were offered 6 kg DM PMR/cow.day, cows grazing the low pasture allowance yielded less milk fat than did cows grazing the medium pasture allowance. Cows grazing the high allowance had greater concentrations and yields of milk protein than did cows grazing the low allowance at all amounts of PMR offered, while cows grazing the medium allowance yielded more milk protein at some amounts of PMR. Pasture utilisation decreased with increases in both pasture allowance and amount of PMR. These results will enable farmers to better optimise feeding systems that combine both pasture and PMR.
Additional keywords: canola, grazing, maize, supplements.
References
AOAC International (2000) ‘Official methods of analysis of AOAC International.’ 17th edn. (AOAC International: Gaithersburg, MD)Auldist MJ, Thomson NA, Mackle TR, Hill JP, Prosser CG (2000) Effects of pasture allowance on the yield and composition of milk from cows of different β-lactoglobulin phenotypes. Journal of Dairy Science 83, 2069–2074.
| Effects of pasture allowance on the yield and composition of milk from cows of different β-lactoglobulin phenotypes.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXmvFKit7k%3D&md5=223cd15a7ac02f8fe2c4792911b1fb5dCAS |
Auldist MJ, Marett LC, Greenwood JS, Wright MM, Hannah M, Jacobs JL, Wales WJ (2014) Replacing wheat with canola meal in a partial mixed ration increases the milk production of cows grazing at a restricted pasture allowance in spring. Animal Production Science 54, 869–878.
Auldist MJ, Marett LC, Greenwood JS, Wright MM, Hannah M, Jacobs JL, Wales WJ (2016) Milk production responses to different strategies for feeding supplements to grazing dairy cows. Journal of Dairy Science 99, 657–671.
| Milk production responses to different strategies for feeding supplements to grazing dairy cows.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2MXhvVCitbnE&md5=6e7da1dc21f54c3989463b9129a68193CAS |
Baird DB (1994) The design of experiments with covariates. PhD Thesis, University of Otago, New Zealand.
Beever DE, Doyle PT (2007) Feed conversion efficiency as a key determinant of dairy herd performance: a review. Australian Journal of Experimental Agriculture 47, 645–657.
| Feed conversion efficiency as a key determinant of dairy herd performance: a review.Crossref | GoogleScholarGoogle Scholar |
Broderick GA (2003) Effects of varying dietary protein and energy levels on the production of lactating dairy cows. Journal of Dairy Science 86, 1370–1381.
| Effects of varying dietary protein and energy levels on the production of lactating dairy cows.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3sXjtVajtLc%3D&md5=5ba38e3b924f384c5a4a4e7020dd3799CAS |
Doyle PT, Stockdale CR (2011) Dairy farm management systems: seasonal, pasture-based, dairy cow breeds. In ‘Encyclopedia of dairy sciences. Vol 2’. 2nd edn. (Eds JW Fuquay, PF Fox, PLH McSweeney) pp. 29–37. (Academic Press: Amsterdam)
Earle D (1976) A guide to scoring dairy cow condition. Journal of Agriculture, Victoria 74, 228–231.
Earle D, McGowan A (1979) Evaluation and calibration of an automated rising plate meter for estimating dry matter yield of pasture. Australian Journal of Experimental Agriculture 19, 337–343.
| Evaluation and calibration of an automated rising plate meter for estimating dry matter yield of pasture.Crossref | GoogleScholarGoogle Scholar |
GenStat (2015) ‘Release 18.’ (VSN International: Hemel Hempstead, UK) Available at http://www.vsni.co.uk [Verified 22 March 2017]
Huhtanen P, Hetta M, Swensson C (2011) Evaluation of canola meal as a protein supplement for dairy cows: a review and a meta-analysis. Canadian Journal of Animal Science 91, 529–543.
| Evaluation of canola meal as a protein supplement for dairy cows: a review and a meta-analysis.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XislWntrs%3D&md5=e9b5afdcee38aaa59dedd3e8daccaadaCAS |
Ipharraguerre IR, Clark JH (2005) Varying protein and starch in the diet of dairy cows. II. Effects on performance and nitrogen utilization for milk production. Journal of Dairy Science 88, 2556–2570.
| Varying protein and starch in the diet of dairy cows. II. Effects on performance and nitrogen utilization for milk production.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXlsFCmsbY%3D&md5=580aceb4e485c2725202e5c0cd0ed4edCAS |
Kolver ES, Muller LD (1998) Performance and nutrient intake of high producing Holstein cows consuming pasture or a total mixed ration. Journal of Dairy Science 81, 1403–1411.
| Performance and nutrient intake of high producing Holstein cows consuming pasture or a total mixed ration.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1cXjsVyjsrs%3D&md5=a05525dca4e64aec72ee27a23e2e103dCAS |
National Health and Medical Research Council (2004) ‘Australian Code of Practice for the Care and Use of Animals for Scientific Purposes.’ 7th edn. (Australian Government: Canberra)
National Research Council (2001) ‘Nutrient requirements of dairy cattle.’ (National Academy Press: Washington, DC)
O’Brien BJ, Murphy JJ, Connolly JF, Mehra R, Guinee TP, Stakelum G (1997) Effect of altering the daily herbage allowance in mid lactation on the composition and processing properties of bovine milk. The Journal of Dairy Research 64, 621–626.
| Effect of altering the daily herbage allowance in mid lactation on the composition and processing properties of bovine milk.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK2sXnslGlsLw%3D&md5=1f9db5ecbbfcee4d1d94246e37a86215CAS |
Oldham JD (1984) Protein-energy interrelationships in dairy cows. Journal of Dairy Science 67, 1090–1114.
| Protein-energy interrelationships in dairy cows.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaL2cXkt1Squro%3D&md5=93ae0a26a77b22469d7ef803b42730d9CAS |
Stockdale C (2000) Levels of pasture substitution when concentrates are fed to grazing dairy cows in northern Victoria. Animal Production Science 40, 913–921.
| Levels of pasture substitution when concentrates are fed to grazing dairy cows in northern Victoria.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXptVWqtL8%3D&md5=cbc4eb1162ff2cafb67636633e2c6033CAS |
Tyrrell HF, Reid JT (1965) Prediction of energy value of cow’s milk. Journal of Dairy Science 48, 1215–1223.
Wright MM, Auldist MJ, Kennedy E, Dunshea FR, Hannah M, Wales WJ (2016) Variation in feeding behavior and milk production among dairy cows when supplemented with 2 amounts of mixed ration in combination with 2 amounts of pasture. Journal of Dairy Science 99, 6507–6518.
| Variation in feeding behavior and milk production among dairy cows when supplemented with 2 amounts of mixed ration in combination with 2 amounts of pasture.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC28Xpt1emsLo%3D&md5=debaf5b47d0f1ff7cf4062e393179168CAS |
