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| Doska,Maria Cecília; Silva,Delma Fabíola Ferreira da; Horst,José Augusto; Valloto,Altair Antônio; Rossi Junior,Paulo; Almeida,Rodrigo de. |
| The present study was conducted to determine the relationship between milk urea nitrogen (MUN) and milk yield, fat and protein contents, breed and season effects, parity and days in milk in dairy cows from Paraná State, Brazil. A total of 127,428 test-days from 16,013 dairy cows belonging to 96 herds enrolled in an official milk recording program were analyzed. Multivariate mixed model methodology was used to determine the relationship between MUN and the fixed effects and the covariable milk production. Milk urea nitrogen averaged 14.45±4.60 mg/dL. Positive and intermediate association between MUN and milk yield (r = 0.34) were found. Holstein cows showed lower MUN adjusted means than crossbred, Jersey, and Brown Swiss cows: 14.18 vs. 15.49, 16.12, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Nutrition; Protein. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300032 |
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| Zambom,Maximiliane Alavarse; Alcalde,Claudete Regina; Martins,Elias Nunes; Santos,Geraldo Tadeu dos; Macedo,Francisco de Assis Fonseca de; Horst,José Augusto; Veiga,Darcy Rodrigues da. |
| O objetivo neste estudo foi avaliar a curva de lactação e a qualidade do leite de cabras Saanen recebendo rações com diferentes relações volumoso:concentrado. Foram utilizadas 20 cabras (59,59 kg ± 6,97) em lactação, distribuídas em delineamento inteiramente casualizado. Os tratamentos consistiram de cinco relações volumoso:concentrado nas rações (40:60, 50:50, 60:40, 70:30 e 80:20), correspondentes a 2,95; 2,83; 2,70; 2,58 e 2,46 Mcal de EM/kg MS. Os animais permaneceram alojados, durante 152 dias, em baias individuais com controle diário da ração ingerida e da produção de leite. Os tratamentos não influenciaram o peso vivo (kg) das cabras. A ingestão de matéria seca (kg/dia) variou ao longo do ciclo produtivo. A produção de leite foi influenciada pelos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cabra leiteira; Ingestão; Níveis energéticos; Peso vivo. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982005000700040 |
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| Lima,Luciano Soares de; Alcalde,Claudete Regina; Freitas,Hanna Sakamoto; Molina,Bruna Susan de Labio; Macedo,Francisco de Assis Fonseca de; Horst,José Augusto. |
| The effects of inactive dry yeast (Saccharomyces cerevisiae) from sugar cane were studied in 18 primiparus Saanen dairy goats (51.07±1.43) on dry matter intake and digestibility, milk production and quality. Animals were distributed in a completely randomized design during 90 days (from day 60 of milking). Diets were composed of soybean meal; soybean meal + dry yeast; or dry yeast, as protein sources, and ground corn, mineral supplement and corn silage (40%). Animals fed the dry yeast diet showed lower intake of dry matter (DM), organic matter (OM), crude protein, ether extract and neutral detergent fiber. Diets did not influence milk yield; however the milk production efficiency (kg of milk produced/kg of crude protein ingested) was better in goats fed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digestibility; Goats; Milk quality; Saccharomyces cerevisiae. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000100033 |
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| Grande,Paula Adriana; Santos,Geraldo Tadeu dos; Ribeiro,Hilton; Damasceno,Júlio César; Alcalde,Claudete Regina; Barbosa,Orlando Rus; Horst,José Augusto; Santos,Fabio Seiji dos. |
| The effects of farm, parity (PO) and month of parturition on milk production, percentage of fat and protein, somatic cell count (SCC), and milk urea nitrogen (MUN) concentration were assessed on four specialized dairy farms using 120 cows. Also, the effects of MUN on gestation rate (GR) and artificial insemination rate (AIR) in early lactation were studied. The parameters of production and milk quality were similar among farms and were not influenced by the month of parturition. Farm D presented the highest MUN concentration. Concentration of MUN, percentages of fat and protein and SCC were not influenced by PO. Cows with a value of MUN between 10.1 and 13.0 mg/dL had the highest AIR and GR between days 55 and 70 postpartum and after 70 days in milk. These... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Gestation; Insemination; Milk urea nitrogen; Parturition order. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000700032 |
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