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Milk Nutrition and Availability of Nutrients in Clinically Healthy Calves and in Calves Suffering from Diarrhea

VAJDA V
Veterinarni Medicina 36, 1991, 449-458

Digestibility of nutrients was determined in healthy calves and in those with diarrhoea at the age of two and three weeks. The total collection of feces and indigestible marker methods (with Cr2O3) were used. High equality of results and statistically nonsignificant differences between the method of a total collection of feces and indigestible marker one in the suckling calves (Tab. II) confirm the suitability of using these two methods to determine digestibility. Based on the composition and commercially recommended feeding guide of milk replacer, it is clear that it has lower digestible energy, Zn and Fe intake. Slightly higher digestible crude protein and Mg intake, optimum Ca and P intake, all these values were calculated for 1 kg of live weight (Tab. I). Nutrient contents is responsible for nutrient ratio which is unabalanced and for low contents of digestible energy (76.5 K) per g of digestible crude protein) instead of recommended values of 100-110 K) per of digestible crude protein in milk replacer in suckling calves. In six clinically healthy calves fed with milk replacer Laktavit twice a day, an apparent digestibility of organic matter was found to be 95.7 +/- 1.8 %, crude protein 93.5 +/- 1.8 %, fat 94.5 +/- 1.4 %, carbohydrates 97.2 +/- 1.5 % Ca absorption was 86.5 +/- 2.8 %, P 95.3 +/- 2.9 %. There was a depressed absorption for Mg 43.4 +/- 6.8 %, Fe 24.2 +/- 4.3 % and Zn 36.8 +/- 3.5 % (Tab. III). In calves with mild diarrhoea (n = 4), the lowered digestibility was found: organic matter 88.3 +/- 1.4 % (P < 0.01), crude protein 82.9 +/- 2.7 % (P < 0.01), fat 92.2 +/- 2.5 % (NS), carbohydrates 94.9 +/- 1.6 % (P < 0.05), Ca 61.9 +/- 6.5 % (P < 0.01), P 81.7 +/- 5.8 % (P < 0.01), Mg 21.3 +/- 4.6 % (P < 0.01), Fe 14.6 +/- 4.9 % (P < 0.01), Zn 21.0 +/- 4.8 % (P < 0.01) as compared with healthy calves. Daily variation of serum metabolic values is referred to the correlation between intake and digestibility of nutrients in healthy calves and calves with diarrhoea (Fig. 1). Low fat metabolism values as well as the variation and the level of urea values are directly related to the low energy intake and are referred to the limited level of proteosynthesis, being more significant in calves with diarrhoea and requiring increased energy contents of milk replacer


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