Cactus Cladodes and Sugarcane Bagasse Can Partially Replace Earless Corn Silage in Diets of Lactating Dairy Cows
2023
Izaac P. S. Medeiros | Sebastião I. Guido | Marco A. S. Gama | Carlos H. M. Silva | Michelle C. B. Siqueira | Camila S. da Silva | Antonio J. Netto | Silas B. Felix | Milena N. Rabelo | Thayane V. M. Santos | Maria A. M. Leite | Marcelo A. Ferreira
This study aimed to evaluate the effects of replacing earless corn silage (ECS) with cactus cladodes (CC: Opuntia spp.) and sugarcane bagasse (SB) on nutrient intake, digestibility, feeding behavior, milk yield (MY), and composition of lactating dairy cows. Ten Holstein cows, weighing 571 ±: 97.0 kg and producing 23.0 ±: 4.4 kg of milk per day, were assigned to two contemporaneous 5 ×: 5 Latin squares. Treatments consisted of five levels of ECS replacement with CC plus SB (0, 25, 50, 75, and 100%). The results showed a linear increase in dry matter (DM) intake (p <: 0.05) (15.98 and 18.73 kg/day) and a quadratic increase (p <: 0.05) in crude protein and energy intake (2.97 kg/day and 27.52 Mcal/day at 95.4 and 88.6% substitution, respectively). Apparent DM digestibility increased (p <: 0.05), but fiber digestibility decreased linearly (p <: 0.05). Treatments had a quadratic effect (p <: 0.05) on MY and fat-corrected MY (24.17 kg/day and 21.9 kg/day at 63.9% and 38.6% CC plus SB, respectively). Milk fat (3.26 and 2.35%) and total solids content decreased linearly (p <: 0.05), whereas the percentages of protein, lactose, and nonfat solids increased (p <: 0.05). Additionally, the CC&ndash:SB diets linearly reduced the time spent on feeding and rumination and total chewing time. For Holstein cows fed common semiarid diets, milk production can be maximized by replacing 38.6% of ECS with CC plus SB.
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