Valorisation de la gourgane (Vicia faba L. major cultivar Baie-St-Paul) dans l'alimentation de la vache laitière : effets sur l'utilisation de l'azote, le méthane d'origine entérique et les performances zootechniques
|Advisor:||Gervais, Rachel; Benchaar, Chaouki|
|Abstract:||The objective of this study was to compare the effect of replacing soybean meal (SBM) and corn grain with ground or rolled faba bean (FB) on nutrient digestion, rumen fermentation, N utilization, methane production and milk performance. Nine Holstein cows (120 days of milk) were used in a 3 × 3 Latin square design (35-d period). The experimental treatments were: 1) Total mixed ration (TMR) containing SBM (control), 2) TMR containing rolled FB and 3) TMR containing ground FB. SBM and corn grain were completely and partially replaced (17% of diet DM), respectively, with either rolled or ground FB, on an isonitrogenous and isoenergetic basis. After 14-d days of adaptation to the experimental diets, feed intake, rumen fermentation characteristics (including protozoa enumeration), in saccoruminal degradability, apparent total-tract digestibility, N excretion, milk performance (production and composition), and CH4 production were measured. Including FB in the diet did not affect dry matter intake, milk production and milk composition. Experimental treatment had no effect on total VFA concentration, acetate:propionate ratio and protozoanumbers. Compared with cows fed the control diet, ruminal NH3 concentration increased and tended to increase for cows fed ground FB and rolled FB, respectively. However, there was no difference in ruminal NH3 concentration between the two processed FB. Apparent total-tract digestibility of crude protein was similar between cows fed the control diet and cows fed rolled FB and tended to increase for cows fed ground FB compared with cows fed the control diet. Urinary and manure (feces + urine) N excretion (g/d or as a proportion of N intake) were not affected by the inclusion of FB in the diet. Enteric CH4 production was similar among the experimental diets. In conclusion, this study showed that including FB (17% of dietary DM) at the expense of SBM and corn grain in the diet had no effect on milk production, N excretion and enteric CH4 production of dairy cows.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||13 March 2019|
|Collection:||Thèses et mémoires|
All documents in CorpusUL are protected by Copyright Act of Canada.