Nutritional value of babassu cake as a replacement for roughage in sheep feed
Keywords:
Alternative feed. Nitrogen balance. Coefficient of digestibility. Intake. Agro-industrial by-product.Abstract
The use of agro-industrial by-products in feeding ruminants has nutritional, environmental and economic
advantages, and helps to sustain the production system. The aim of this study was to evaluate the nutritional value of diets
containing babassu cake as a substitute for Tifton-85 hay (70, 140, 210, 280 and 350 g kg-1 dry matter: DM). Twenty-five castrated
male sheep with a mean body weight of 49.6 ± 9.4 kg were used, distributed in metabolic cages in a completely randomised
design. Voluntary intake was obtained from the difference between the amount of feed provided and the leftovers the following
morning. To evaluate nutrient digestibility and nitrogen (N) balance, samples of urine and faeces were collected separately.
There was no effect on DM intake; however, crude protein (CP) and ether extract intake increased linearly increased linearly.
The addition of babassu cake had no effect on DM digestibility (mean value of 604.6 ± 272.8 g kg-1). Apparent CP digestibility
and total digestible nutrient content showed increasing linear behaviour, while the digestibility of acid detergent fibre decreased
linearly. The level of retained N varied from 9.72 ± 1.12 to 15.51 ± 1.84 g day-1 with the ratio to ingested N ranging from 521.0
± 26.7 to 578.4 ± 31.8 g kg-1 N. The addition of babassu cake to replace the roughage, increased the nutritional value of the diet.
Babassu cake can be included up to a total of 350 g kg-1 DM in the diet as a substitute for Tifton-85 hay.
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Variable Level of substitution (g kg-1 DM) Equation r2 CV (%)
70 140 210 280 350
IN, g day-1(1) 18.66 19.55 22.28 24.20 26.88 Ŷ = 15.99 + 0.30X** 0.98 20.44
FN, g day-1(2) 6.70 6.51 6.94 6.95 7.54 Ỹ =6.93 ± 0.38ns - 22.66
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AN, g day-1(4) 11.96 13.04 15.34 17.25 19.34 Ŷ = 9.70 + 0.27X** 0.99 20.74
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Table 6 - Nitrogen balance in sheep fed diets containing babassu cake as a substitute for Tifton-85 hay
** =P<0.01; * =P<0.05; ns =P>0.05; (1)ingested nitrogen; (2) faecal nitrogen; (3)urine nitrogen; (4)absorbed nitrogen; (5)retained nitrogen (6) retained nitrogen,
in grams per unit of metabolic size; (7) ratio of retained nitrogen to ingested nitrogen (RN/IN)Rev. Ciênc. Agron., v. 51, n. 3, e20196999, 2020 9
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