Banca de DEFESA: ANTONIO JOELSON NETTO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ANTONIO JOELSON NETTO
DATE: 24/02/2022
TIME: 08:00
LOCAL: ON-LINE
TITLE:

WHOLE GERM OF EXTRA FAT CORN IN DIET FOR LACTING COWS

KEY WORDS:

biohydrogenation, co-products, fat, human health, semi-arid

PAGES: 105
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUMMARY:

This study aimed to investigate the effects of whole corn germ (WCG) on intake variables and nutrient digestibility, nitrogen utilization efficiency, blood metabolites, production and fatty acid (FA) composition of milk from dairy cows. Ten Holstein cows with 90 ± 10 days of lactation and production of 24.2 ± 3.5 kg of milk/day were assigned to diet treatments consisting of increasing levels of WCG (0, 4, 8, 12 and 16%) based on dry matter (DM) in a 5 x 5 Latin square design replicated with periods of 21 days. With the exception of the consumption of EE which increased linearly, the consumption of all nutrients decreased linearly with the
inclusion of WCG. The digestibility of DM, MO and NDF reduced linearly, while it increased for EE with the inclusion of WCG. N consumption and daily N excretion in urine and faeces decreased linearly with WCG inclusion. On the other hand, the N utilization efficiency increased linearly with the inclusion of WCG. The N excreted in milk showed a quadratic response, with maximum excretion estimated at 130 g/day with 7.15% inclusion of WCG. Milk production varied quadratically in response to the inclusion of WCG, with the highest milk production estimated at 25.4 kg/day for the level of 7.61% inclusion of WCG. On the other hand, PLC linearly reduced with the inclusion of WCG. The concentration of fat and total solids decreased linearly with the inclusion of higher levels of WCG, but the concentration of protein and lactose were similar between treatments. The concentration of fat and total solids decreased linearly with the inclusion of higher levels of WCG, but the concentration of protein and lactose were similar between treatments. Serum cholesterol levels increased from 756 to 1,480 mg/L, but other blood metabolites were not changed with the inclusion of WCG. With the exception of the trans-16:1 isomers, the proportions of short and medium chain fatty acids in milk fat decreased linearly or quadratically with the inclusion of WCG, while the opposite was observed for the 18:0 and 18 isomers. :1/18:2, including those with conjugated double bonds. In particular, a shift from trans-11 to trans-10 occurred with the inclusion of WCG, resulting in a quadratic shift in trans-11 18:1 and cis-9, trans-11 CLA and a linear increase in trans-10 18 :1, trans-10, cis-12 CLA and trans-9, cis-11 CLA.These results indicate that WCG can be an effective source of fat to increase the rumen flow of biohydrogenation intermediates in cows fed forage cactus (Opuntia) as a partial substitute for sugarcane.

BANKING MEMBERS:
Externa à Instituição - ANA LUIZA DA COSTA CRUZ BORGES - UFG
Externo à Instituição - ADRIANO HENRIQUE DO NASCIMENTO RANGEL - UFRN
Interna - 6384968 - ANTONIA SHERLANEA CHAVES VERAS
Presidente - 1226425 - MARCELO DE ANDRADE FERREIRA
Externa à Instituição - STELA ANTAS URBANO - UFRN