Banca de QUALIFICAÇÃO: DAYANNE BENTES DOS SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : DAYANNE BENTES DOS SANTOS
DATE: 09/07/2021
TIME: 14:00
LOCAL: Videcoconferência via zoom
TITLE:

TRANSMISSION OF PASSIVE IMMUNITY AND ITS CORRELATIONS WITH HEALTH AND PONDERAL PERFORMANCE IN GIROLANDO CALVES

KEY WORDS:

Bovine, newborn, immunoglobulin, disease

PAGES: 20
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUBÁREA: Reprodução Animal
SPECIALTY: Fisiopatologia da Reprodução Animal
SUMMARY:

Raising calves is an activity of great importance in dairy farming, as it represents the future of milk production on the farm, allowing the replacement of heifers with better productive potential, coming from genetic improvement programs, in addition to being a way of obtaining income additional from the marketing of surplus heifers. From the first day of life until weaning, the calf rearing process requires good management practices and special attention to the smallest details, since the highest calf mortality rate occurs in this period (COELHO, 2009). However, care with this category is often overlooked in the vast majority of farms with misconceptions that you should spend as little as possible on these animals since they are not in their productive phase. However, the mortality of calves in the first months of life is one of the main causes of damage in cattle production worldwide and the failure of passive immunity transfer (FTIP) is one of the factors of great contribution to these high mortality rates. Thus, small investment and management changes can result in significant impacts on the promotion of health and performance of calves and heifers. Thus, colostrum is configured as a simple and easy procedure. The supply of colostrum in quality, quantity and adequate time is crucial for maintaining the health and future performance of the heifers (TEIXEIRA et al. 2017). In this phase, calves are constantly challenged by the environment, while their organism still depends on defenses acquired by ingesting colostrum, which is not always adequate (BITTAR, 2016). Colostrum is vital for the newborn calf as it contains immunoglobulins and is also rich in essential nutrients to provide energy for growth. The “3 Qs” of colostrum (Quantity, Quality, How fast) ensure that calves receive at least three liters of colostrum, containing more than 50g L-1 of IgG in two hours. This becomes preponderant because bovine calves are totally dependent on the consumption of colostrum to acquire immunity, here called passive colostral immunity, until their bodies start producing their own antibodies, called active immunity. Immunoglobulins are products of the animal's immunization (SALLES, 2011). In addition, the increase in maternal and fetal cortisol levels during late pregnancy and on the day of calving interferes with the calves' immune status, causing neutrophilia, lymphopenia and reduced phagocytic activity of macrophages and neutrophils, essential cells in the immune response. In this way, calves are born particularly sensitive to infections, acquiring immunological protection only after ingesting colostrum (TEIXEIRA et al, 2017). Colostrum is an essential element for the calf's survival and development. According to Cortese (2009) and Yang et al. (2015), colostrum is produced in the final period of pregnancy and becomes the cow's first milk secretion. Davis and Drackley (1998) and Godden (2008) reiterate that colostrum is the one that precedes milk. It is a mixture of milk secretions and is present in the constituents of blood serum. Bessi et al. (2002) and Brambell (1958) point out that colostrum is made up of immunoglobulins, nutrients, hormones, and growth factors; therefore, it is considered a rich and essential food for the calf's health, with the constituents being absorbed intact. in the newborn's feeding, as long as the cow, the quality of the colostrum, the colostrum method, and the absorption capacity of the epithelial cells of the calf's small intestine, are healthy.

2 OBJECTIVES
2.1 GENERAL OBJECTIVE
· Correlate the quality and quantity of colostrum offered to calves, with the health and performance of gyratory calves from birth to weaning in a rearing system in an Argentine calf.

2.2 SPECIFIC OBJECTIVES
· Evaluate the quality of colostrum and the method of colostrum;
· Determine the occurrence of failures in the transfer of passive immunity (FTIP);
· Correlate FTIP with the incidence of diarrhea and the performance of calves at weaning;
· Check if there is the effect of race, calving order, body condition score (BCS), number of lactations, milking number, and rearing system (silvopastoral, Barn compost and confinement) in FTIP.

BANKING MEMBERS:
Presidente - 1368855 - RINALDO BATISTA VIANA
Externa ao Programa - 1551773 - LUCIARA CELI CHAVES DAHER
Externo ao Programa - 838.789.122-34 - WALDJANIO DE OLIVEIRA MELO - UFRA