Influence of different protein supplements on sheep milk quantity and quality
2012
Yossifov, Marin (Institute of Animal Science, Kostinbrod (Bulgaria))
Animal milk productivity depends mainly on the quantity and quality of feedstuffs. In our study was analyzed and discussed the influence of different protein supplements on quantity and quality of sheep milk at the pick of lactation (27 – 72 lactating day). Sixteen lactating dairy sheep of Synthetic Bulgarian Dairy Population (SBDP) were used in 60-d feeding trial (7-d preparatory + 45-d experimental period + 8-d closing periods). Animals were randomly divided into two diet treatments: 1./ control diet (CD) with roughage (75 %), corn (8 %), supplement (0.65 %), wheat (8.79 %) and sunflower meal (SFM) (8.26 %), and 2./ experimental diet (ED) with replacing part of the wheat and whole SFM with rapeseed meal (RSM) (10 %). Diets were iso-caloric and equal in protein truly digestible in small intestines (PDI), Ca, P and approximately equal in crude protein (CP). Analyzed 960 milk samples showed that in this segment of lactation period the high lactopoiesis is related to source of dietary protein. No significant differences were found in average daily milk yield (+ 0.73 %) and milk composition: solids non fat (SNF) + 0.82; fat content of milk + 2.30 and milk protein content – 0.53 % per sheep for ED, compared with CD. RSM- based diet significantly (p<0.01) increased 6.5 % fat corrected milk yields (+ 3.05 %) from one sheep per day.
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