Lack of Response to Addition of Degradable Protein to a Low Protein Diet Fed to Midlactation Dairy Cows

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Changes of milk fat, crude protein, true protein, NPN and protein:fat ratio in Holstein cows fed a high concentrate diet from early to late lactation

Percentages and yields of fat, crude protein (CP), true protein (TP) and non-protein nitrogen (NPN) wereassessed in milk of four groups of Holstein cows, at early, mid and late lactation (days in milk 20-70, 71-110, 111-150 and 151-210), on a diet rich in concentrates during a hot summer. Four milk samples were taken from individual cows at 10-day intervals. Milk fat percentages were close to b...

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responses of milk urea nitrogen content to dietary rume degradable protein level in lactating holstein dairy cows

nine multiparous lactating cows averaging 171 days in milk were divided according to days in milk and milk production into three 3×3 latin squares with three 3-week periods to investigate the effect of rumen degradable protein on milk urea nitrogen. diets were formulated to provide 3 concentrations of dietary rumen degradable protein (9.8, 10.8, and 11.8% of dry matter), while rumen undegradabl...

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ژورنال

عنوان ژورنال: Journal of Dairy Science

سال: 1993

ISSN: 0022-0302

DOI: 10.3168/jds.s0022-0302(93)77718-8