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Animal Nutrition and Feed Technology
Year : 2011, Volume : 11, Issue : 1
First page : ( 19) Last page : ( 26)
Print ISSN : 0972-2963. Online ISSN : 0974-181X.

Effect of Bypass Protein on Milk Yield in Indian Cattle – A Meta-analysis

Suresh K.P., Bhatta Raghavendra*, Mondal S., Sampath K.T.

National Institute of Animal Nutrition and Physiology Adugodi, Bangalore-560 030, India.

*Reprint request: Dr. Raghavendra Bhatta, E-mail: ragha0209@yahoo.com.

Received:  21  March,  2009.


Twenty Indian studies pertaining to feeding of undegradable dietary protein (UDP) on milk production in lactating cows were selected. Based on inclusion and exclusion criteria to safeguard against the selection bias, only fourteen studies could be considered for conducting a meta-analysis. All the data included in the present study were from experiments conducted under iso-caloric diets and early to mid lactation with medium milk production (around 10 kg). The bypass protein intake was converted to UDP intake g/animal/day as input variable and milk yield was converted to 4% FCM (fat corrected milk) in order to achieve uniformity in study results. The UDP intake (g/animal/day) was categorized into 0–100, 101–200, 201–300, 301–400, 401–500 and 501–600. A database on UDP intake (g/animal/day), milk yield (kg) and fat % were developed based on the studies selected. The data were analysed using the Metacalculator. The results indicated increase in milk yield as the UDP intake was increased. The amount of 4% FCM was 6.62 kg (SD: 0.43) at 0–100 g UDP intake and progressively increased to 10 kg when the UDP intake was >600 g/animal/day. The milk production response was observed to be quadratic i.e. milk production increased with increasing UDP intake and thereafter milk production showed decreasing trend for unit increase in UDP levels. From the meta-analysis of the data, it could be concluded that feeding of UDP is beneficial in increasing milk yield and the optimum level of UDP required for production of 10 kg 4% FCM among Indian cattle is about 571 g/animal/day.



Bypass protein, UDP, Milk yield, Milk fat, Meta-analysis.


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