Banca de QUALIFICAÇÃO: CLAUDIA SIQUEIRA CALDAS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CLAUDIA SIQUEIRA CALDAS
DATE: 28/07/2023
TIME: 14:00
LOCAL: Google meet
TITLE:

SUPPLEMENTATION OF GRAZING LACTATING COWS WITH CASSAVA ROOT SILAGE: NUTRITIONAL, PHYSICO-CHEMICAL, SENSORIAL QUALITY, ECONOMIC ANALYSIS OF MINAS FRESCAL CHEESE

KEY WORDS:

Profitability, cheese production, concentrated supplementation, dairy cows.

PAGES: 46
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SUMMARY:

The objective was to evaluate the production yield, the physical-chemical and sensory characteristics and the economic viability of Minas fresh cheese with the inclusion of cassava root silage (SRM) in the food supplement of dairy cows in grazing. Ten primiparous Girolando cows, with an average weight of 373.45 ± 63.55 kg and an initial average of 76 days of lactation, were used, distributed in two simultaneous 5 × 5 Latin squares. Five treatments were evaluated, namely: I – grazing cows without concentrated supplementation (SSC); II - grazing cows receiving 5 kg of concentrated supplement with 0% SRM; III - grazing cows receiving 5 kg of concentrated supplement with 26% SRM; IV - grazing cows receiving 5 kg of concentrated supplement with 52% SRM and V - grazing cows receiving 5 kg of concentrated supplement with 78% SRM. The inclusion of SRM was made in substitution of corn meal. Milk samples used for cheese making were collected on the 18th day of each experimental period and analyzed for fat, protein, lactose, total solids, defatted dry extract, casein, pH and acidity. On the 19th day of each experimental period, the cheeses were manufactured, and the levels of fat, protein, total dry extract, moisture, fat in the dry extract, acidity, pH, yield, colorimetric analysis and sensory acceptance test were determined. The cost of the animal supplement per day, the cost of supplementation, the cost generated by cheese production, and profits from cheese production were analyzed. Concentrated supplementation increased cheese protein content and cheese production per cow (kg of cheese/cow/day) (P<0.05), there was a trend (P = 0.08) of higher gross yield for cheeses of SSC cows. The coordinate (b*) and saturation index (Chroma) were higher for cheeses from supplemented animals when compared to SSC animals (P<0.05). The appearance and color of the cheeses had higher scores (P<0.05) for the animals that received the concentrated supplementation. The inclusion of SRM in the concentrate did not affect the physical-chemical, sensorial composition and production yields of the cheese, however, it showed a linear increase tendency (P=0.09) of the luminosity (L*) and tendency (P = 0, 06) of linear reduction of the coordinate (a*) with the inclusion of the SRM. Concentrated supplementation raised production costs by 8.01 to 11.68 reais when compared to the SSC treatment, however, they presented the highest profits. Concentrated supplementation with the highest level (78%) of SRM inclusion had the highest costs and supplementation with 0% cassava had the lowest costs. Costs to supplement with SRM, the 52% inclusion level had the lowest total cost of production, with the best yield and highest net profit. Therefore, pasture supplementation improves the protein content and yield of cheese production. Up to 78% of cassava root silage can be used to replace corn, without causing damage to the production, composition and quality of Minas fresh cheese.

BANKING MEMBERS:
Presidente - 1354679 - KALIANDRA SOUZA ALVES
Interno - 1143911 - RAYLON PEREIRA MACIEL
Externo ao Programa - 3271084 - ANDRE SANCHES DE AVILA
Externo ao Programa - 2125373 - JOÃO PAULO BORGES DE LOUREIRO
Externo ao Programa - 1331235 - THIAGO CARVALHO DA SILVA