Abstract The objective of this study was to evaluate the influence of the milking method, the storage conditions and the SCC (Somatic Cell Count) increase on the quality of raw milk. Monthly evaluations were performed out over a year in 21 tanks by monitoring the refrigeration temperature and the storage time of the milk in the tank. The tanks were grouped into three temperature levels. Milk storage time intervals were established in each tank: up to 24 h of storage; between 24 and 48 h; and above 48 h. The effect of SCC on the composition was evaluated in three categories: Low SCC; Medium SCC; High SCC. In the analyzed period, 10.8 % presented low SCC, followed by 46.5 % with medium SCC, while 42.7 % had high SCC. There was a positive correlation between SCC and protein, and a negative correlation between SCC and lactose. It is concluded that the milking method does not influence the microbial contamination of the milk; however, longer storage time and increased temperature influenced an increase in microorganism counts in milk. In evaluating the hygienic/sanitary quality of the milk, 42.7 % had high SCC and the total bacterial counts presented values above the values recommended by legislation.

Resumen Las condiciones del ordeño y almacenamiento pueden afectar a la calidad de la leche cruda. Se hizo una evaluación de la influencia del método de ordeño, las condiciones de almacenamiento y el aumento en el recuento de células somáticas (RCS) en la calidad de la leche cruda. Se realizaron evaluaciones mensuales durante un año en 21 tanques mediante el monitoreo de la temperatura de refrigeración y el tiempo de almacenamiento de la leche en el tanque. Los tanques se agruparon en tres rangos de temperatura. Se establecieron intervalos de tiempo de almacenamiento de leche en cada tanque: hasta 24 h; de 24 a 48 h; y más de 48 h. El efecto de RCS sobre la composición se evaluó en tres categorías: RCS bajo; RCS intermedio; y RCS alto. En el período analizado, solo el 10.8 % de los tanques tuvieron un RCS bajo, el 46.5 % tuvieron uno intermedio, y el 42.7 % uno alto. Hubo una correlación positiva entre el RCS y el nivel de la proteína, y una correlación negativa entre el RCS y el nivel de la lactosa. Los resultados indican que el método de ordeño no influye en la contaminación microbiana de la leche. En contraste, un mayor tiempo de almacenamiento y el aumento de la temperatura causaron un aumento en el RCS y el conteo microbiano total. Las prácticas de higiene en los hatos y los tanques estudiados requieren de mejoramiento, ya que el 42.7 % de los tanques presentaron un RCS alto y los conteos bacterianos totales presentaron valores superiores a los recomendados por la legislación.

ABSTRACT. The objective of this study was to evaluate the influence seasons of the year and somatic cell counts (SCC) on physical-chemical and sensory parameters of cow’s milk from individual and collective refrigeration tanks with different milking systems. In addition to analyzing the sensory acceptance of pasteurized milk and coalho cheese developed with high (> 800,000 cells mL-1) and low SCC levels (<200,000 cells mL-1). Seasonality did not affect fat content, casein, lactose, total solids, defatted dry extract and SCC, but lower protein levels than May and June were observed from July to September. Based on the SCC results, milk from refrigeration tanks was classified as low SCC and high SCC. The samples were used to obtain pasteurized milk and coalho cheese which were sensorially evaluated for general appearance, odor and flavor by a panel of untrained tasters using a hedonic scale of 9 points. Pasteurized milk with high and low SCC presented pleasant sensory characteristics to the consumer up until two days of storage. The same behavior was observed for coalho cheese at 20 and 40 days of shelf life, respectively.

O objetivo deste trabalho foi estimar parâmetros genéticos para idades ao primeiro (IPP) e segundo partos (ISP), idades ao primeiro (IPP PEN) e segundo partos penalizadas (ISP PEN), e a ocorrência de parto até os 38 meses de idade (PP38), em bovinos da raça Canchim, bem como estimar as relações genéticas entre essas características e o peso (PE420) de machos e femêas e a circunferência escrotal (CE420) de novilhos, medidos aos 420 dias de idade. Foram estimados parâmetros genéticos em análises bicaracterísticas, por meio de inferência bayesiana. As análises foram realizadas entre CE420 e PE420 e as características reprodutivas medidas em fêmeas. As características reprodutivas das fêmeas devem apresentar baixa resposta à seleção, e mudanças no manejo e nas condições ambientais melhoram tais características. A seleção quanto ao maior peso aos 420 dias de idade não deve provocar mudanças nas características reprodutivas em fêmeas, enquanto a seleção para o aumento da circunferência escrotal, na mesma idade, contribui para melhorar tais características.

The objective of this work was to estimate genetic parameters for age at first (AFC) and at second (ASC) calvings, penalized age at first (AFC PEN) and at second (ASC PEN) calvings, and occurrence of calving until 38 months of age (PP38) in Canchim breed, as well as to estimate the genetic correlations between these traits with weight (PE420) of males and females, and scrotal circumference (CE420) measured at 420 days of age. Genetic parameters were estimated by two-trait analyses using the Bayesian inference. The analyses were performed between CE420 and PE420, and the reproductive traits measured in the females. The female reproductive traits should show low response to selection, and changes in the management and environmental conditions improve these traits. Selection for the higher weight at 420 days of age does not change female reproductive traits, while selection to increase scrotal circumference, at the same age, contributes to improve such traits.