Banca de DEFESA: ELIZABETH QUEIROZ LOPES DE VASCONCELOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELIZABETH QUEIROZ LOPES DE VASCONCELOS
DATE: 27/02/2023
TIME: 08:00
LOCAL: Departamento de Zootecnia/Google Meet
TITLE:

DAIRY GOATS FEED DIFFERENT BASAL DIETS AND A FAT SOURCE: MILK FATTY ACIDS PROFILE

KEY WORDS:

Roughage, biohydrogenation, polyphenols, CLA.

PAGES: 30
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Nutrição e Alimentação Animal
SPECIALTY: Avaliação de Alimentos para Animais
SUMMARY:

The objective was to evaluate the fatty acid profile of milk from Saanen goats fed diets containing a lipid source and cactus pear associated with different sources of fiber. Twelve goats with average initial weight of 48.9±7.3kg, average production of 2.8kg of milk/day and average lactation period of 84 days were distributed into three 4x4 Latin squares. Each experimental period lasted 21 days, with 14 days for the adaptation of the animals to the experimental diets and 07 days for data and sample collection. The experimental diets consisted of cactus pear, cultivar Miúda, concentrate containing extra fat whole corn germ as a lipid source and one of four sources of fiber: corn silage, sorghum silage, pangolan grass hay or sugarcane bagasse. -sugar. The individual proportions of the main fatty acids secreted in milk fat, the sum of fatty acid groups, the n-6/n-3 ratio and the activity index of the enzyme stearoyl-CoA desaturase (SCD-1) in milk were analyzed. . The use of different forages promoted significant changes in the proportion of fatty acids secreted in milk. Among them, a higher proportion of C18:0 was found in the milk of animals fed pangolon hay compared to sugarcane bagasse (P<0.01). However, both forages promoted higher concentrations of C18:1 trans-11 and CLA cis-9, trans-11 in milk compared to silages (P<0.01). Furthermore, the inclusion of silage in the diets increased the secretion of saturated fatty acids (P<0.01) and reduced the content of monounsaturated and polyunsaturated fatty acids (P<0.001) in milk. However, there was a higher proportion of omega n-3 in the milk of goats fed sorghum silage (P<0.01). The different basal diets did not alter the content of CLA trans-10, cis-12 and n-6 fatty acids or SCD-1 activity. Based on the results found, it is concluded that basal diets containing pangolan hay or sugarcane bagasse are more suitable for improving the fatty acid profile of milk from goats fed with lipid sources that are more beneficial to human health.

 

COMMITTEE MEMBERS:
Presidente - MARCELO DE ANDRADE FERREIRA
Externo à Instituição - ADRIANO HENRIQUE DO NASCIMENTO RANGEL - UFRN
Externa à Instituição - STELA ANTAS URBANO - UFRN