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| Porcionato,Marco Aurélio de Felicio; Soares,Weber Vilas Boas; Reis,Carolina Barbosa Malek dos; Cortinhas,Cristina Simões; Mestieri,Lucinéia; Santos,Marcos Veiga dos. |
| The aim of this work was to evaluate the association between milk flow, teat morphological measurements and subclinical mastitis prevalence in Gir cows. Eighty cows in the 2nd and 3rd lactations, with 90 to 200 days of lactation, were divided according to milk flow during milking into fast or slow groups. Teat morphometry was assessed by ultrasound scanning of the right anterior teat and external measurements. Milk samples were collected for somatic cells count (SCC) and microbiological culture. The effect of milk flow during milking was evaluated by analysis of variance of milk yield, SCC, morphometry and external measurements. The association of morphometry and external measurements of the teats with the SCC and microorganisms found in milk were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gir; Lactation; Mammary gland; Milking; Morphology. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001200023 |
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| Botaro,Bruno Garcia; Lima,Ygor Vinícius Real de; Cortinhas,Cristina Simões; Silva,Luís Felipe Prada e; Rennó,Francisco Palma; Santos,Marcos Veiga dos. |
| The objective of this study was to evaluate the effect of genetic polymorphism of kappa-casein, breed and seasonality on the physicochemical characteristics, composition and stability of milk in commercial dairy herds. A total of 879 milk and blood samples were collected from 603 Holstein and 276 Girolando cows, obtained during rainy and dry seasons. Milk samples were analyzed to determine the physicochemical characteristics, composition and ethanol stability, while blood samples were subjected to polymerase chain reaction to identify the kappa-casein genotype. The frequencies of genotypes AA, AB and BB of k-casein were respectively, 66.83, 31.84 and 1.33% for Holstein, and 71.38, 27.90 and 0.72% for the Girolando cows, respectively. The A allele was more... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crioscopy; Dairy cow; Ethanol stability test; Genetic variant; Polymerase chain reaction; Titratable acidity. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001200022 |
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| Cortinhas,Cristina Simões; Freitas Júnior,José Esler de; Naves,Julianne de Rezende; Porcionato,Marco Aurélio de Felicio; Silva,Luís Felipe Prada e; Rennó,Francisco Palma; Santos,Marcos Veiga dos. |
| The present study was carried out with the objective of evaluating the effects of feeding dairy cows with organic or inorganic sources of zinc (Zn), copper (Cu) and selenium (Se) on blood concentrations of these minerals, blood metabolic profiles, nutrient intake and milk yield and composition. Nineteen Holstein cows were selected and randomly assigned to two groups for receiving organic (n = 9) or inorganic (n = 10) sources of Zn, Cu and Se from 60 days before the expected date of calving to 80 days of lactation. Samples of feed, orts and milk were collected for analysis. Body condition score (BCS) was determined and blood samples were collected for analysis of Zn, Cu and Se concentrations, as well as for metabolic profile. Supplying organic or inorganic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chelate; Microminerals; Nutrition; Organic sources. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600023 |
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| Botaro,Bruno Garcia; Cortinhas,Cristina Simões; Mestieri,Lucinéia; Machado,Paulo Fernando; Santos,Marcos Veiga dos. |
| The aim of this study was to estimate the concentration of milk true protein (TP) by mid-infrared absorbance method (MIR) in samples from bulk tank of dairy herds, and to determine the correlation between the results of TP of milk determined by Kjeldahl and MIR. Forty nine dairy herds were selected (17 Holstein, 6 Jersey and 26 Girolando) for monthly collections of samples from bulk tanks during the period of one year (284 samples). Fat, lactose, crude protein and total solids were firstly determined by MIR, and then analyzed for total and true protein by Kjeldahl method. The regression equation to estimate TP contents based on MIR crude protein determination was as follows: TP=0.0021+(1.0104xCP), where: TP is the content of true protein, CP is the crude... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cow; Milk composition; Protein determination. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000800028 |
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