Banca de DEFESA: IZAAC PEREIRA DA SILVA MEDEIROS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : IZAAC PEREIRA DA SILVA MEDEIROS
DATE: 26/02/2024
TIME: 14:00
LOCAL: Departamento de Zootecnia/Google Meet
TITLE:

REPLACING GREEN CORN SILAGE WITHOUT COBS WITH PALM PLUS 1 SUGARCANE BAGASSE FOR LACTATING COWS

KEY WORDS:

Keywords: cacTaceae; CLA; semiarid; byproducts.

PAGES: 60
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Nutrição e Alimentação Animal
SPECIALTY: Avaliação de Alimentos para Animais
SUMMARY:

The use of forage preserved in the form of silage is widely used in the semi-arid 4 region. However, due to irregular rainfall, it is often unfeasible to make it. Therefore, 5 alternatives are necessary in order to overcome the forage deficit in the dry season of the year. 6 In this scenario, cactus and sugar cane bagasse, together, can be a viable alternative. Thus, the 7 objective of this work was to evaluate the effects of replacing corn silage without cob (ECS) 8 with forage cactus (CC; Opuntia spp.) and sugarcane bagasse (SB) on nutrient intake, 9 digestibility, behavior intake, milk production (MY) and composition of milk from dairy cows, 10 and milk fatty acid profile. Ten Holstein cows, weighing 571 ± 97.0 kg and producing 23.0 ± 11 4.4 kg of milk per day, were distributed in two simultaneous 5 × 5 Latin squares. Treatments 12 consisted of five levels of replacement of ECS with CC plus SB (0, 25, 50, 75 and 100%). The 13 results showed a linear increase in dry matter (DM) intake (p < 0.05) (15.98 and 18.73 kg/day) 14 and a quadratic increase (p < 0.05) in crude protein and energy intake (2.97 kg/day and 27.52 15 Mcal/day, with 95.4 and 88.6% replacement, respectively). DM apparent digestibility increased 16 (p < 0.05), but fiber digestibility decreased linearly (p < 0.05). The treatments had a quadratic 17 effect (p < 0.05) on PL and PL corrected for fat (24.17 kg/day and 21.9 kg/day, with 63.9% and 18 38.6% PF plus BC, respectively). Milk fat (3.26 and 2.35%) and total solids content decreased 19 linearly (p < 0.05), while the percentages of protein, lactose and skimmed solids increased (p < 20 0.05). Furthermore, CC–SB diets linearly reduced time spent feeding and ruminating and total 21 chewing time. Vacenic acid (C18:1 trans-11) and rumenic acid (CLA cis-9, trans-11) increased 22 linearly. In addition to maximizing milk production, the CC + SB mixture reduces the saturated 23 fatty acid content of milk and increases the proportions of desirable unsaturated fatty acids such 24 as C18:1 trans-11 and CLA cis-9, trans 11. For cows semi-arid Holsteins fed common diets, 25 milk production can be maximized by replacing 38.6% of ECS with CC plus SB. 

COMMITTEE MEMBERS:
Presidente - MARCELO DE ANDRADE FERREIRA
Interno - JOAO PAULO ISMERIO DOS SANTOS MONNERAT
Externa ao Programa - 2234529 - LUCIANA FELIZARDO PEREIRA SOARES - UFRPEExterno à Instituição - ADRIANO HENRIQUE DO NASCIMENTO RANGEL - UFRN
Externa à Instituição - MICHELLE CHRISTINA BERNARDO DE SIQUEIRA