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Influence of declining level of feed intake and varying the proportion of starch in the concentrate on milk production and whole tract digestibility in dairy cows



Influence of declining level of feed intake and varying the proportion of starch in the concentrate on milk production and whole tract digestibility in dairy cows



Livestock Production Science 17(1): 19-36



Five dairy cows fitted with a large diameter rumen cannula were fed diets of two-thirds pelleted concentrate that contained 5 graded levels of starch from 8 to 32%. Measurements were made over one lactation to determine the effects of diet intake level and proportion of starch in the concentrate on milk production and whole tract digestibility. Intake declined form 19.44 to 4.86 kg organic matter(OM) per day at equal intervals. Milk production declined linearly (P < 0.05 at about 0.7 kg week-1, from 25.4 kg day-1, as level of feed intake declined. Fat production declined linearly (P < 0.05) as the proportion of starch in the concentrate increased, reflecting a linear (P < 0.05) decline in milk fat proportion. The apparent digestion of all dietary component, except starch, increase d(P < 0.05) as the level of intake declined, although the form of the change differed. The extent of the increase in neutral detergent (ND) fibre digestion was large, almost 14 percentage units. The apparent digestion of OM and nitrogen (N) increased linearly (P < 0.05) as the proportion of starch in the concentrate increased. The estimated true digestibility of N and non-ND fibre OM declined at an increasing rate (P < 0.05) as level of intake increased and the proportion of starch in the concentrate increased. However, the extent of change for OM was not large in either case (6 and 5 percentage units respectively.

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Accession: 001617078

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DOI: 10.1016/0301-6226(87)90050-9



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