Abstract
This work was carried out to study three rations (CON – control ration, LIN – whole linseed ration, and WCS – whole canola seed ration) on performance, apparent digestibility coefficient of dry matter (DMDC), organic matter (OMDC), crude protein (CPDC), neutral detergent fiber (NDFDC), acid detergent fiber (ADFDC), gross energy (GEDC), ether extract (EEDC) and carcass characteristics in Nellore heifers finished in feedlot. The acid insoluble ash (AIA) was used as internal maker to calculate apparent digestibility. The collecting was done during a five-day-period. Corn silage and cottonseed hulls were used as roughage source. The concentrates consisted of soybean meal, ground corn grain, cassava starch by-products, mineral salt, urea, and limestone (CRO) differing or not, by inclusion, from linseed (LIN) or whole canola seed (WCS). Twenty-four heifers with average age of 18 months and initial weight of 277.67 + 32.12 kg were used. A completely randomized design with three treatments and nine repetitions was used. The experiment was taken during an eighty-seven-day-period. No differences (P>0.05) were observed among the treatments for intake of dry matter, organic matter, crude protein, neutral detergent fiber, acid detergent fiber, feed:gain ratio, average daily gain, hot carcass yield, fat thickness, and Longissimus dorsi area. The gross energy and ether extract intake were higher (P 0.05) were detected between the CPDC, NDFDC, and ADFDC treatments. The CON treatment presented higher values (P<0.05) of DMDC, OMDC, and GEDC as compared to the LIN treatment. The EEDC was higher (P<0.05) in the CON treatment as compared to the CAN treatment. These feed could be used where the price were favorable. However, the oils of these feed were used for human nutrition with high economic worth. KEY WORDS: AAI, apparent digestibility, canola seed, cottonseed hulls, heifers, linseed.
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