Banca de DEFESA: MURIEL DE OLIVEIRA GUEDES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MURIEL DE OLIVEIRA GUEDES
DATE: 24/08/2023
TIME: 09:00
LOCAL: Videoconferência
TITLE:

PASSIVE IMMUNE TRANSFER IN GIROLANDO CALVES

KEY WORDS:

passive immunity transfer; colostrum; total serum protein; calves; newborns.

PAGES: 72
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUBÁREA: Clínica e Cirurgia Animal
SPECIALTY: Clínica Veterinária
SUMMARY:

Dairy farms are intensely focused on lactating cows and it is common knowledge that replacement females will be the production cows tomorrow. Thus, the health and performance of calves will impact the future of production, which is why high mortality rates at this stage are extremely costly for the economic viability of production systems. The objective of this work was to evaluate the quality of colostrum provided to calves, to evaluate the transfer of passive immunity (TPI) through serum total protein values and to evaluate the influence of the transfer of passive immunity on average daily weight gain (ADG). Transfer of passive immunity was evaluated in 56 calves from property A, which received 10% of birth body weight by nipple bottleor with an esophageal tube feeder within first 4 hours of life and in 18 calves from property B, which received colostrum ad libitum by nipple bottle within first 4 hours of life. Blood samples were collected at birth, before colostrum delivery (0h), at 48 hours and at 30 days of life to evaluate the transfer of passive immunity. The quality of the colostrum offered to each animal was measured by total solids tests with the aid of an optical Brix refractometer, from milk obtained from the first milking performed shortly after calving. All animals received high quality colostrum, with indices ranging from 18 to 32% Brix, with an average of 27.44% Brix. Among the animals that received at least 10% of birth body weight in colostrum, failure to transfer passive immunity (FTPI) was observed in 7.2% of the animals, while among those that received colostrum ad libitum until satiety, the FTPI rate was 28%. It was observed that the calves submitted to the interventionist management of colostrum feeding had a mean total serum protein at 48 hours of life of 6.49 g/dL [95% CI; 6.20 - 6.78 g/dL], while those who suckled ad libitum until satiety had slightly lower rates, with a mean serum protein of 5.82 g/dL [95% CI; 5.36 - 6.28 g/dL]. The most frequently diagnosed causes of death were cattle tick fever, diarrhea and bovine respiratory disease. The present study emphasizes that the administration of quality colostrum in adequate quantity and time led to a higher rate of TIP success and calf health.

COMMITTEE MEMBERS:
Presidente - 306996 - JOSE RENATO JUNQUEIRA BORGES
Interno - 3356525 - ANTONIO RAPHAEL TEIXEIRA NETO
Interno - 1307139 - FABIANO JOSE FERREIRA DE SANT ANA
Externa à Instituição - VIVIANI GOMES - USP