Banca de DEFESA: CONRADO TRIGO DE MORAES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CONRADO TRIGO DE MORAES
DATA : 24/04/2020
HORA: 09:00
LOCAL: INSTITUTO DE ZOOTECNIA
TÍTULO:

Performance of lactating dairy cows under pasture BRSKurumi elephant grass with and without energy supplementation. 

PALAVRAS-CHAVES:

Fatty acid, Milk production, Pasture, Tropical forage.

PÁGINAS: 62
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
SUBÁREA: Produção Animal
RESUMO:

Moraes, Conrado Trigo.Performance of lactating dairy cows under pasture BRSKurumi elephant grass with and without energy supplementation. 2020.62f.Dissertation(Master in Animal Science.Animal Science Institute, Federal Rural University of Rio de Janeiro, Seropédica, Rio de Janeiro, 2020. 

The objective of the study was to evaluate the forage potential of elephant grass BRS Kurumi managed under rotational stocking and the effect of energy supplementation on the performance of lactating dairy cows during the rainy season, as well as the composition of the fatty acid profile in milk. The experiment was carried out at the José Henrique Bruschi Experimental Field (EmbrapaGado de Leite), located in the municipality of Coronel Pacheco-MG. Six Holstein x Gir cows were used, with an average milk production, bodyweight (BW), body condition score (BCS) and lactating days of 18.0 ± 2.89 kg / day of milk, 560 ± 66 kg, 2.50 ± 0.21 and 99 ± 12, respectively. The experimental design used was the complete reversion (switchback). The evaluations were carried out during three grazing cycles, with an adaptation period of 14 days and six days of sample collection. The concentrate (ground corn) was supplied twice a day, 2 kg / cow / day in the morning and 1 kg / cow / day in the afternoon (base of natural matter), totaling 3 kg / cow / day, in order to reduce the energy-protein imbalance of the diet and also to meet the energy requirements of the animals. Performance evaluations were performed based on nutrient intake, milk production (kg / cow / day) and their composition in terms of fat, protein, lactose, urea nitrogen and fatty acid profile, as well as variation in BW and BCS and plasma metabolite profile. There was a reduction of 1.1 kg of dry matter (DM) in pasture consumption per kg of DM of concentrate consumed, which reduced the consumption of neutral detergent fiber and crude protein by 19% and 14%, respectively, in the supplementation treatment. There was an effect of treatments on milk production (MP), MP corrected for fat and energy, with an increase of 11.8%; 9.0% and 10.1%, respectively, for treatment with supplementation. The response to supplementation in kg of milk per kg of DM of concentrate provided was 0.57, and the levels of fat, protein, lactose did not differ between treatments. However, there was a trend in relation to fat content, which was 4.7% lower in treatment with supplementation. Milk fat from cows fed exclusively on pasture showed better nutritional quality, with lower levels of hypercholesterolemic fatty acids and higher levels of health-beneficial fatty acids, such as oleic, vaccenic, rumenic and omega 3 fatty acids. Energy supplementation promoted an increase in milk production as well asan increase in nitrogen use efficiency and,regardless of consumption of concentrate, the milk obtained from cows in BRS Kurumi pasture showed enormous nutraceutical potential, with high levels of oleic, vaccenic, rumenic and α-linolenic fatty acids.

 

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