Banca de DEFESA: DUSTIN ANDRÉ CHAVES HOFFMANN

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DUSTIN ANDRÉ CHAVES HOFFMANN
DATE: 03/08/2020
TIME: 09:00
LOCAL: Web Conferência via Google Meet - meet.google.com/xpa-hgzq-ruy.
TITLE:

Metabolic profile of dairy cows in the prepartum period and their influence on the immediate postpartum period, colostrum quality and newborn immunity.

KEY WORDS:

NEFA, calcium, brix, calves, peripartum.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

The aim of this study was to evaluate which biochemical markers in the pre-delivery of the dairy cow, influenced its immediate post-delivery, the quality of colostrum and the heifer's immunity. It was carried out in a commercial dairy farm in Palma Sola - SC, from July to September 2019, with 52 pregnant multiparous Holstein cows being pre-selected, and those that gave birth to twins or males were discarded from the experiment, leaving 21 cows and 21 calves . All animals were kept on the Compost Barn system receiving the same diet. On days -20 of the expected date of delivery and 24 hours after delivery, blood samples, body condition score (ECC) and animal weighing were performed. If there was no anticipation of delivery, it was collected on day -5. The urine collection of the cows was done in the pre-calving period to measure the pH, and colostrum was collected immediately after calving to determine the brix® percentage. Blood collections from the calves were performed 24 hours after colostration. The time it took the calves to receive colostrum was considered. Calf plasma was used to estimate the efficiency of colostrum and immunity by% brix and total plasma proteins (PPT). In serological samples of cows, calcium (Ca), magnesium (Mg), non-esterified fatty acids (NEFA), beta hydroxy butyrate (BHBA), paraoxonase (PON-1) and albumin were evaluated. In serological samples from calves, PON1, albumin, gamma glutamyl transferase (GGT), Ca and Mg were evaluated. The data on the cow's pre and postpartum metabolic variables, as well as the calf's metabolic variables, and those related to colostrum quality, were subjected to correlation, regression, variance, main components and logistic regression analyzes using the SAS program. In the principal component analysis, NEFA in postpartum was shown to be higher in cows with higher urinary pH in the prepartum period and higher BHBA in the postpartum period. NEFA and BHBA in the postpartum period was higher in cows with lower Ca in the prepartum period. And the cows with the highest NEFA and BHBA in the pre and postpartum were those that had the lowest% brix of colostrum. The% brix of the mother's colostrum directly influenced the% brix and PPT of the heifer. The NEFA in the pre-calving of the cow, had a negative influence on the immunity markers, the higher the NEFA, the lower the% brix of the mother's colostrum,% brix of the heifer and PPT. In multivariate regression analysis, it was shown that pre-delivery NEFA was the marker that most influenced cow postpartum markers and calf% brix, along with colostrum time and colostrum% brix (P = 0.0092 ; r2 = 0.83). Cows with values above the median (≥ 0.08 mmol / L) and quartile (≥ 0.18 mmol / L) of NEFA in the prepartum period, had lower calcemia in the immediate postpartum period (7.16 ± 0.24 mg / dl, P = 0.04; 6.86 ± 0.35 mg / dl, P = 0.01). From the data obtained in our study, we concluded that the prepartum NEFA was the marker that most influenced the immediate postpartum of the cow, being directly related to the calcemia, and also in the immunity of the heifer.

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Interno - 1760760 - CARLOS EDUARDO NOGUEIRA MARTINS
Presidente - 1046884 - ELIZABETH SCHWEGLER