Banca de DEFESA: ANTENOR FORNAZARI NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANTENOR FORNAZARI NETO
DATA : 19/09/2018
HORA: 09:30
LOCAL: IFC Campus Araquari
TÍTULO:

Evaluation of feed efficiency of beef cattle in feedlot and its relationship with zootechnical indexes, blood metabolites and starch digestion

PALAVRAS-CHAVES:

Biological efficiency, High concentrate, Phenotype, Nutrition, Ruminants

PÁGINAS: 42
GRANDE ÁREA: Ciências Agrárias
ÁREA: Medicina Veterinária
RESUMO:

The feedlot of beef cattle is strategic, the investment in animals and feed are the two biggest costs of the system, and the use of the best animals and the maximum use of feed are the key factors for the success of the activity. The gain efficiency can be evaluated by different methodologies, among them body weight (BW) x age, daily weight gain (DWG), feed conversion (FC), feed efficiency (FE) or residual feed intake (RFI) between others. Any of the parameters used, have positive and negative points, inherent to each evaluation method. For the experiment, feed efficiency was chosen, since it is an objective, reliable method, already used in genetic improvement, of easy replicability, also associated with meat quality. The study sought to verify the existence of factors and their relationships with FE and that could potentially be used to assist identify animals that are more efficient. The measurements of performance, such as, dry matter intake (DMI), measuring also some blood metabolites (erythrocytes, haemoglobin, haematocrit, leukocytes, cholesterol, glucose, albumin and urea) and the starch content in the faeces and the apparent digestion of the starch. The experiment was carried out in Santa Catarina State, Brazil. Fourteen non-castrated male bovine animals in the growing stage were evaluated in the confinement system, commercial cross-breeding of European breeds, with a mean weight of 285±25,17 kg, under conditions of environmental equality and management, fed on a diet based on a high concentrate x voluminous ratio (80:20) for a period of 42 days. As results, it was observed that the animals were distributed in two groups in relation to feed efficiency, being the animals of high efficiency (HE) and the animals of low efficiency (LE). Finding difference between the groups in the DWG parameters (p=0.02), FC (p=0.03) and DMI (p=0.07). The FE had positive correlation with DWG, faecal starch (FS), glucose and DMI. As the main negative correlations, urea, cholesterol and apparent starch digestion. Discriminant analysis was performed for the HE and LE groups, finding the most efficient and inexpensive model (p=0.17, 100% classification). The study found evidence of correlations between FE and zootechnical indexes, blood metabolites and FS, thus showing potential for further investigation in the area, and later used them as auxiliary tools in genetic selection and breeding. Thus, it is easier to identify the most efficient animals in feed conversion, thus reducing risk and increasing the profitability of feedlots of beef cattle.

MEMBROS DA BANCA:
Presidente - 1760760 - CARLOS EDUARDO NOGUEIRA MARTINS
Interno - 1430573 - MIGUELANGELO ZIEGLER ARBOITTE
Externo à Instituição - RICARDO KAZAMA - UFSC