5 documents found, page 1 of 1
Associations of days open with milk urea nitrogen and other herd traits in dair...
Almeida,Rodrigo de; Doska,Maria Cecília; Horst,José Augusto; Valloto,Altair Antônio; Santos,Geraldo Tadeu dos; Lima,Luciano Soares deABSTRACT We evaluated the association of monthly milk urea N (MUN) concentrations before conception and days open in high-producing dairy cows from commercial herds in Southern Brazil. Other herd traits were also investigated regarding their relationship with days open. A database containing 16,569 monthly test-day records (obtained from 3,926 lactations of 2,145 cows) for productive, reproductive, and milk qua...
Population structure and inbreeding of Holstein cattle in southern Brazil
Sieklicki,Michelli de Fátima; Mulim,Henrique Alberto; Pinto,Luís Fernando Batista; Valloto,Altair Antônio; Pedrosa,Victor BrenoABSTRACT The present investigation aimed to evaluate the population structure and inbreeding of Holstein herds in southern Brazil. To carry out the analysis, the Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH) in Brazil provided the data, which consisted of a pedigree file of 206,796 animals born between 1970 and 2014. Results regarding the following parameters were determined: pedigree...
Sources of variation in milk urea nitrogen in Paraná dairy cows
Doska,Maria Cecília; Silva,Delma Fabíola Ferreira da; Horst,José Augusto; Valloto,Altair Antônio; Rossi Junior,Paulo; Almeida,Rodrigo deThe 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 d...
Performance of lactating goats fed diets containing inactive dry yeast
Gomes,Ludmila Couto; Alcalde,Claudete Regina; Macedo,Francisco de Assis Fonseca de; Santos,Geraldo Tadeu dos; Valloto,Altair AntônioTwenty-four Saanen goats (15 multiparous and 9 primiparous) from 21 days prepartum to 200 days in lactation were used to evaluate milk yield and composition. Animals were randomly distributed in a 3 × 2 factorial arrangement (3 diets × 2 parity orders) and fed a 40:60 forage:concentrate diet composed of soybean meal, soybean meal + dry yeast or dry yeast as protein source, plus ground corn, mineral supplement a...
Replacement of corn silage with cassava foliage silage in the diet of lactating...
Santos,Geraldo Tadeu dos; Modesto,Elisa Cristina; Souza,Nilson Evelázio de; Ítavo,Luís Carlos Vinhas; Jobim,Clóves CabreiraThis study aimed to evaluate the effect of corn silage (CS) replacement by cassava's foliage silage (CFS) on the production and quality of milk. Twelve lactating dairy cows were used in a randomized block experimental design with four treatments and three repetitions per block. CS was replaced by CFS at the levels of 0, 20, 40, and 60%. The replacement of CS by different levels of CFS had very low effect on the...