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Registros recuperados: 1.076 | |
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CARVALHO,Giovanna Araújo de; SALMAN,Ana Karina Dias; CRUZ,Pedro Gomes da; SILVA,Francyelle Ruana Faria da; HALFEN,Jéssica; SCHMITT,Eduardo. |
ABSTRACT The relationship between the indices of thermal comfort and internal temperature in lactating cows was evaluated inRondônia, western Amazonia in a 2 × 2 crossover trial carried out with eight Girolando cows, ½ Holstein × ½ Gyr (n=4) and – Holstein × ¼ Gyr (n=4), grazing palisade grass supplemented with or without soybean oil concentrates. Data logger thermometers adapted to intravaginal devices (hormone free) were used to measure internal temperatures (IT) every 10 min over 48 h. Concomitantly, environmental parameters (air temperature, relative humidity, wind speed, and solar radiation) were collected for the estimation of the temperature-humidity index (THI), equivalent temperature index (ETI), and predicted respiratory rate (PRR).... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heat stress; Holstein × Zebu; Dairy cattle; Environmental stress index. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300191 |
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Carvalho, Vinícius Emanoel; Araújo, Saulo Alberto do Carmo; Alves, Danilo de Oliveira; Santos, Carlos César dos; Rocha, Norberto Silva. |
This study aimed to evaluate the intake and milk yield of crossbred cows (Holstein x Zebu), under two management strategies, based on 95% light interception and fixed days. Eight lactating cows with body weight of 466 kg (± 35 kg) and lactation stage of 137 days (± 107 days) were used, four animals were assigned to each treatment. Dry matter intake was estimated indirectly, using neutral detergent insoluble fiber as internal indicator and chromium oxide as external indicator. This was a completely randomized design, with four replications, two grazing strategies and three days of occupation. The animals under light management showed dry matter intake on the first day (11.42 kg) similar to the second day (9.57 kg), and this was similar to the third day... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Produção Animal; Forragicultura animal production; Dairy cattle; Grazing strategies; Light interception; Milk production; Occupation period.. |
Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/46843 |
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Araújo, Cláudio Vieira de; UFMT; Resende, Gisele Socorro Amaral; Araújo, Sinome Inoe; Ufra; Rennó, Francisco Palma; USP; Tomazini, Ana Paula Inoe; Unipar-Umuarama; Marques, José Ribamar Felipe; EMBRAPA-AO. |
Informações de 2.981 lactações referentes às primeiras lactações de vacas da raça Pardo-Suíça, filhas de 151 reprodutores, distribuídas em 62 rebanhos, com parições entre 1980 a 2002, foram utilizadas para se verificar a existência da heterogeneidade de variância entre rebanhos e o seu impacto na classificação de reprodutores. As produções de leite foram utilizadas para se classificar os rebanhos em níveis de alta e baixa produção. Utilizou-se um modelo animal que incluiu os efeitos fixos de rebanho-ano e estação de parto, efeito linear do período de lactação, linear e quadrático da idade da vaca ao parto, como covariáveis, além dos efeitos aleatórios de animal e ambiente temporário. Estimaram-se componentes de variância, considerando-se os rebanhos como... |
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Palavras-chave: 5.04.02.00-5 avaliação genética; Heterogeneidade; Bovinos leiteiros; Parâmetros genéticos genetic evaluation; Heterogeneity; Dairy cattle; Genetic parameters. |
Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/5197 |
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Borges, Christiano Raphael de Albuquerque; UFRPE; Azevedo, Marcílio de; UFRPE; Lima, Ivalda de Albuquerque; UFRPE; Brasil, Lúcia Helena de Albuquerque; UFRPE; Ferreira, Marcelo de Andrade; UFRPE. |
The behavior of 15 Girolando cows from three genetic groups (1/2, 5/8 and 3/4 HG) in feedlots was evaluated. Experimental design was completely randomized with 3 treatment (genetic groups) and 5 replicates. The animals were evaluated by the variables: food, rumination, rest, locomotion, water intake, demand and time in the shade, and other activities. Group 5/8 HG spent more time feeding (267.88 min.) than groups 3/4 HG (245.55 min.) and 1/2 HG (259.55 min.). Idle standing time was higher (204.66 min.) for 3/4 HG when compared to the other groups. There was no statistical difference for the duration of rest in the shade. Solar radiation and THI were the factors which most influenced the animals’ behavior. Results show that the genetic groups 5/8 and 3/4 HG... |
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Palavras-chave: Dairy cattle; Stress; Ethology. |
Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/11306 |
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ALBANI,KÁSSIO D.; LOPES,LEANDRO S.; CAMPIGOTTO,GABRIELA; BALDISSERA,MATHEUS D.; SILVA,ALEKSANDRO S. DA. |
Abstract: The aim of this study was to evaluate the effects of subcutaneous calcium administration in post-partum dairy cows with respect to carbohydrate, protein and lipids metabolism, as well as its effects on milk composition. Twenty post-partum dairy cows were randomly divided into two groups (n=10): a control and a treated group with a single dose (150 mL) of calcium. Blood collection was performed on post-partum days 1, 2, 3, 7 and 10. In addition, we measured serum levels of total calcium, total proteins, albumin, globulins, glucose, cholesterol, triglycerides, as well as creatine kinase (CK) activity. We determined milk composition on post-partum days 5, 10 and 20. Serum total calcium levels was higher on post-partum days 3 and 7 in the treated... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal health; Dairy cattle; Pre-delivery; Subcutaneous calcium; Hypocalcemia. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300806 |
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Ferreira,Abílio G.T.; Henrique,Douglas S.; Vieira,Ricardo A.M.; Maeda,Emilyn M.; Valotto,Altair A.. |
The objective of this study was to evaluate four mathematical models with regards to their fit to lactation curves of Holstein cows from herds raised in the southwestern region of the state of Parana, Brazil. Initially, 42,281 milk production records from 2005 to 2011 were obtained from "Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH)". Data lacking dates of drying and total milk production at 305 days of lactation were excluded, resulting in a remaining 15,142 records corresponding to 2,441 Holstein cows. Data were sorted according to the parity order (ranging from one to six), and within each parity order the animals were divided into quartiles (Q25%, Q50%, Q75% and Q100%) corresponding to 305-day lactation yield. Within each... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Milk yield; Mathematical models selection; Non-linear models. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100503 |
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Rodrigues,D.S.; Leite,R.C.. |
A redução da produção de leite em bovinos é um dos aspectos majoritários na composição total do valor de impacto econômico provocado por R. (B.) microplus. Portanto, o objetivo deste estudo foi estimar a perda decorrente da carga parasitária, observada em uma propriedade produtora de leite na região central de Minas Gerais. Para tal, foram consideradas 30 contagens de carrapatos, distribuídas de maneira uniforme durante o período de um ano, em um rebanho bovino com 74 vacas de composição racial 3/4 Holandês x Zebu, mantidas sob sistema de produção intensivo em pastoreio. A partir dos dados observados, foi possível estimar que 937.968 teleóginas completaram o repasto sanguíneo e foram responsáveis pela redução de 6.678 litros de leite durante o período... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhipicephalus (Boophilus) microplus; Losses; Dairy cattle; Minas Gerais. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000500039 |
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Cruz,C.; Driemeier,D.; Cerva,C.; Corbellini,L.G.. |
Realizaram-se o diagnóstico e o tratamento de afecções podais responsáveis por claudicação em bovinos leiteiros no Estado do Rio Grande do Sul. Durante 18 meses, 524 animais apresentaram 883 lesões digitais clínicas. A prevalência de bovinos afetados foi de 50,2% e as lesões mais comuns foram dermatite digital (29,9%), úlceras de sola (18,3%) e dermatite interdigital (17,8%). Das lesões córneas, 91,5% ocorreram nas unhas laterais posteriores. |
Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Dairy cattle; Foot lesion. |
Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352001000600006 |
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Motta,R.G.; Ribeiro,M.G.; Perrotti,I.B.M.; Motta,D.G.; Domingues,P.F.; Lucas,T.M.; Zamprogna,T.O.; Listoni,F.J.P.. |
An uncommon outbreak of mastitis caused by Arcanobacterium pyogenes in 26 cows is reported. The epidemiological findings, clinical signs, microbiological exams, somatic cell count, in vitro susceptibility profile of strains, efficacy of intramammary treatment and control measures were discussed. Florfenicol (96.2%), cefoperazona (92.3%), cefaloxin (84.6%) and ceftiofur (84.6%) were the most effective antimicrobials, and neomicin (27.0%) and enrofloxacin (17.4%) the least effective antimicrobials. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Arcanobacterium pyogenes; Outbreak; Mastitis. |
Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352011000300027 |
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Huang,Y.; Oikonomou,G.; Hu,J.; Li,Y.; Du,X.; Du,Y.; Liu,Y.; Zhang,P.; Wang,P.; Yu,H.; Tu,J.; Kakatsidis,N.; Colina,A.H.; He,B.. |
ABSTRACT Aims to investigate the effects of grape seed proanthocyanidin extract (GSPE) on production performance, metabolism, and anti-oxidative status of Holstein dairy cattle in early lactation. Forty-eight multiparous Holstein dairy cattle were assigned to four groups (CON, G20, G40 and G80) and supplied with 0, 20, 40, and 80mg GSPE/kg of body weight/day. G20 significantly increased milk yield compared with other groups. Milk protein and non-fat-solids were increased in G20, G40 and G80 groups compared with the control group only at the 7th day during the experiment. No significant difference was observed in milk fat and somatic cell count, nor on parameters of energy metabolism in blood, liver function and kidney function between the four groups.... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Grape seed; Proanthocyanidin; Milk production; Antioxidant properties. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000401207 |
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Ogawa,L.; Freire,R.L.; Vidotto,O.; Gondim,L.F.P.; Navarro,I.T.. |
Three-hundred and eighty-five serum samples were taken from dairy cows on 90 farms in 12 counties from the northern region of the Paraná State, Brazil. The samples were analyzed by IFAT for the detection of anti-Neospora caninum and anti-Toxoplasma gondii IgG antibodies. Forty-five (12%) samples were seropositive to N. caninum, while 102 (26%) samples were seropositive to T. gondii. Only four animals were seropositive to both coccidia. No significant difference was observed between the N. caninum serology and any of the variables studied, such as dairy cattle management, milk production, reproductive problems, feeding, and presence of dogs, cats and rodents. These data suggest that neosporosis is present among dairy cattle in the studied geographic region... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Seroepidemiology; Neospora caninum; Toxoplasma gondii. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000300006 |
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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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Primavesi,Odo; Freitas,Alfredo Ribeiro de; Primavesi,Ana Cândida; Oliveira,Haydée Torres de. |
The Canchims creek watershed in São Carlos, SP, Brazil, was chosen to evaluate water quality affected by dairy and beef cattle production systems based on tropical pasture. The water samples were collected monthly, during three years, at six sampling points: spring in a tropical forest, spring in an intensive dairy production system, two dam springs, and stream water upward and at the delta. Results showed differences (P<0.01) among sampling points for the mean parameters. True color, hardness, turbidity, electric conductivity, alkalinity, pH, chemical oxygen demand and consumed oxygen explained well differences among sampling points. According to current legislation standards, water quality fitted with most of the established parameters for class 2,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Beef cattle; Intensive management; Pasture; Water quality; Watershed. |
Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200013 |
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Almeida,Gledson Luiz Pontes de; Pandorfi,Héliton; Baptista,Fátima; Guiselini,Cristiane; Ferreira,Marcelo de Andrade; Cruz,Vasco Fitas. |
ABSTRACT: This research aimed to assess Girolando calves’ concentrate intake and performance when placed in shelters with distinct roofing materials and programs of supplementary lighting during the milk-feeding stage. In order to so, we used a completely randomized design with a 3×3 factorial arrangement, with three replications. Females Girolando calves (n=27) were assigned in individual shelters at random with 3 different roofing materials (fiber cement tile, recycled tile and thatched roofs) and subjected to three lighting programs (12, 16 and 20 hours). No interaction was observed between roofing material and lighting programs, whilst no significant effect (P>0.05) was observed among the roofing materials. The supplementary lighting, by providing... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal performance; Dairy cattle; Light duration; Weight gain. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000900651 |
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Macedo,Madlaine Frigo Silveira Barbosa de; Macedo,Cesar Augusto Barbosa de; Barros,Luiz Daniel de; Martins,Guilherme Felipelli; Sandeski,Ligia Mara; Zulpo,Dauton Luiz; Cunha,Ivo Alexandre Leme da; Taroda,Alessandra; Cardim,Sérgio Tosi; Garcia,João Luis. |
Toxoplasma gondii is a worldwide parasite recognized as one of the main zoonosis in human beings. The present study aimed to evaluate serology of T. gondii from dairy cows slaughtered in an abattoir for human consume. Serum samples from 120 dairy cows (60 pregnant and 60 non-pregnant) were collected, and indirect fluorescent antibody test (IFAT) was performed to detect anti-T. gondii antibodies by considering positive animals with titers ≥50. Serologic results from cows showed 29.1% (35/120), which 29 (48.3%) e 6 (10,0%) were from pregnant and non-pregnant cows, respectively. This revealed a risk 8.4 times-higher of positively in pregnant than non-pregnant cows (OR=8.4, 2.91<OR<25.6, P<0.0001). There was a statistical difference in the anti-T.... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Toxoplasma gondii; Dairy cattle; Antibody occurrence. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000600019 |
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Arashiro,Eduardo Kenji Nunes; Libonati,Hugo; Santos,Gustavo Bervian dos; Nogueira,Luiz Altamiro Garcia; Souza,Guilherme Nunes de; Lilenbaum,Walter; Brandão,Felipe Zandonadi. |
ABSTRACT: Reproductive efficiency is one of the key elements for any milk production system to be successful. In this regard, reproductive management must be planned properly and the identification of the main reproductive disorders that affect the herd is primordial for decision-making. The aim of the present study was to identify the main reproductive problems that affect dairy herds on Rio de Janeiro (RJ), Brazil. Data regarding breed, age, reproductive disorder occurrence, and breeding system were individually collected from dairy cows raised at 25 farms located at RJ. The occurrence of reproductive disorders was reported in 37% of the studied animals. Estrous repetition (76.2%) and abortion (15.6%) were the most frequent reproductive problems... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Reproductive disorders; Repeat breeding. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000700701 |
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Abrego Castillo, Himelda. |
El objetivo de la presente investigación fue conocer la estructura y funcionalidad productiva y económica del sistema de producción de leche del municipio de Nopalucan, Puebla. La información se obtuvo de visitas técnicas y la aplicación de un cuestionario en 50 unidades de producción. Y se analizó con estadística descriptiva, análisis de varianza y métodos multivariados, que permitieron definir las tipologías de las explotaciones. En la parte estructural, se encontraron en promedio, hatos compuestos por 7.9 cabezas de bovinos Holstein y sus cruzas con Suizo y Jersey, de las cuales, 2.5 fueron vacas en producción; la superficie agrícola fue de 4.4 ha, con productores de 53 años de edad y con una experiencia de 21.9 años dedicados a la actividad lechera,... |
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Palavras-chave: Sistemas de producción; Bovinos lecheros; Composición de leche; Livestock production systems; Dairy cattle; Milk composition; Estrategias para el Desarrollo Agrícola Regional; EDAR; Maestría. |
Ano: 2011 |
URL: http://hdl.handle.net/10521/613 |
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Registros recuperados: 1.076 | |
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