Effets des conditions de culture et de la fertilisation de plantes fourragères sur leur rendement, leur composition nutritive, et les impacts sur l'équilibre nutritif chez les ruminants
|Abstract:||Dairy production and beef cattle farms form an important agricultural sector. Forage crops used to feed the cattle represent 40% of all the cultivated land in Quebec. Forage quality has an impact on nutritional disorders such as hypomagnesemia and hypocalcemia of lactating cows. The influence of climatic, soil, management and fertilization factors on the yield and quality of hay can be described by linear and mixed models (Mitscherlich); this model allows to account for fixed effects that affect all samples in the same way, and random effects, specific to each sample. The final goal is to develop a forage yield response and hypomagnesemia risk model for environmental and management factors. The model relates the yield, the mineral and textural analysis of the plots where the forage crops were grown, the climatic data collected during the tests, such as the degree-days, the accumulation and diversity of the precipitations, the nitrogen, phosphorus and potassium fertilization, and the forage mixture. The factors that most significantly affect forage yields are nitrogen and phosphate fertilization, an increase in degree-days, increased precipitation, a decrease in clay content, and a decrease in the balance [ Legumes|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||22 December 2018|
|Collection:||Thèses et mémoires|
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