Canola meal as a protein supplement in dairy rations Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8p58ph02c

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  • A four months continuous feeding trial was conducted to evaluate Canola meal as a single protein supplement in complete dairy rations. Thirty high producing Holstein cows in the second week of lactation were randomly alloted in groups of ten to one of three isonitrogenous (15% CP) and isocaloric (1.6 Mcal/kg of NE lactation) rations, containing either Canola meal (38% CP), Soybean meal (46% CP) or Cottonseed meal (41% CP). Productive and physiological parameters were analysed. Milk production, both actual and 4% FCM, did not differ (P>.05) among diets. However, Canola meal fed cows tended to produce more milk than animals in other treatments. No differences (P>.05) were found for milk protein, fat, total solids nor solids not fat percentages. Milk solids not fat yield was the only milk component produced in different (P=.024) amounts between diets and was mainly influenced by milk production. Canola meal glucosinolates, tannins and phytate did not impair feed intake, however animals in this group showed lower feed conversion. Rumen total volatile fatty acid content was higher (P=.031) for Canola meal and Soybean meal groups. No significant differences (P>.05) were found for rumen volatile fatty acid composition, acetic:propionic ratio, ammonia nitrogen or pH. Urea nitrogen, total protein and albumin plasma concentrations were not different (P>.05) among diets, suggesting that Canola, Soybean and Cottonseed meals were equal as protein supplements. White blood cells was the only hematological parameter (packed cell volume, red blood cells, white blood cells and hemoglobin were analysed) that significantly differed (P=.011) among diets. Soybean meal fed cows showed higher white blood cell count, which is believed to have a physiological origin. Triiodothyronine uptake values were significantly higher (P=.015) in Soybean meal fed cows. However, Triiodothyronine uptake as well as Tetraiodothyronine concentration and Free Thyroxine Index correspond to euthyroid values, indicating that Canola meal glucosinolates did not affect the thyroid metabolism of the experimental animals. Results indicate that Canola meal may be used as a single protein supplement in rations for high producing cows, to satisfactorily replace traditional sources of protein such as Soybean meal and Cottonseed meal.
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