The partial replacement of soyabean meal and rapeseed meal with feed grade urea or a slow-release urea and its effect on the performance, metabolism and digestibility in dairy cows

Animal : an International Journal of Animal Bioscience
L A SinclairG H Jones

Abstract

The objectives of the study were to determine the effect of the partial replacement of soyabean meal and rapeseed meal with feed grade urea or a slow-release urea on the performance, metabolism and whole-tract digestibility in mid-lactation dairy cows. Forty-two Holstein-Friesian dairy cows were allocated to one of three dietary treatments in each of three periods of 5 weeks duration in a Latin square design. Control (C) cows were offered a total mixed ration based on grass and maize silages and straight feeds that included 93 g/kg dry matter (DM) soyabean meal and 61 g/kg DM rapeseed meal. Cows that received either of the other two treatments were offered the same basal ration with the replacement of 28 g/kg DM soyabean and 19 g/kg DM rapeseed meal with either 5 g/kg DM feed grade urea (U) or 5.5 g/kg DM of the slow-release urea (S; Optigen®; Alltech Inc., Kentucky, USA), with the content of maize silage increasing. There was no effect (P > 0.05) of dietary treatment on DM intake, which averaged 22.5 kg/day. Similarly, there was no effect (P > 0.05) of treatment on daily milk or milk fat yield but there was a trend (P = 0.09) for cows offered either of the diets containing urea to have a higher milk fat content (average of 40....Continue Reading

References

Nov 1, 1992·Journal of Animal Science·J B RussellC J Sniffen
Nov 1, 1981·The British Journal of Nutrition·H W SymondsK A Collis
May 1, 1995·The British Journal of Nutrition·G E LobleyD A Farningham
Oct 14, 2004·Journal of Human Lactation : Official Journal of International Lactation Consultant Association·Thomas W HaleJames Boger
Oct 13, 2006·Journal of Dairy Science·G L GolombeskiD J Schingoethe

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Citations

Dec 3, 2013·Animal : an International Journal of Animal Bioscience·K D SinclairL A Sinclair
Apr 10, 2015·Tropical Animal Health and Production·Hugo ImaizumiFlávio Augusto Portela Santos
Nov 20, 2019·Animals : an Open Access Journal From MDPI·Cristina SaroFrancisco Javier Giráldez
Apr 16, 2020·Animals : an Open Access Journal From MDPI·Saheed A SalamiJules Taylor-Pickard
Feb 13, 2021·PloS One·Saheed A SalamiJules Taylor-Pickard
Mar 13, 2021·Journal of the Science of Food and Agriculture·Alejandro BelancheDavid R Yañez-Ruiz

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