oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Heterose sobre os pesos de bovinos Canchim e Aberdeen Angus e de seus cruzamentos recíprocos  [cached]
PEROTTO DANIEL,CUBAS ANTONIO CARLOS,MOLETTA JOSé LUIZ,LESSKIU CARLOS
Pesquisa Agropecuária Brasileira , 2000,
Abstract: O trabalho foi conduzido para estimar a heterose sobre os pesos ao nascimento (PNT), à desmama (P210) e ao ano (P365) e sobre os ganhos de pesos médios diários do nascimento à desmama (G210) e da desmama ao ano (G365) nas quatro primeiras gera es do sistema de cruzamentos alternados entre as ra as Canchim (C) e Aberdeen Angus (A). Os dados de 1.147 bezerros nascidos de 1981 a 1998 foram analisados pelo método dos mínimos quadrados, ajustando-se um modelo linear que incluiu os efeitos linear e quadrático da idade da m e do bezerro e os efeitos fixos de sexo, grupo genético, mês e ano de nascimento do bezerro. Estimativas de heterose e de outras diferen as genéticas foram estimadas por contrastes entre médias e testadas pelo teste t. O contraste "CA" foi positivo e significativo (P<0,001) para as cinco características. O contraste F1CAF1AC teve sinal negativo e foi altamente significativo (P<0,001) para P210 e G210 e significativo (P<0,05) para P365. A gera o F1 exibiu heterose de 4,8% para P210 e de 4,9% para G210. A heterose materna foi de 3,7%, 5,8%, 6,3% e 20,4%, respectivamente, para P210, G210, P365 e G365. A heterose média das terceira e quarta gera es do cruzamento alternado entre C e A foi de 4,6% para P210, 5,3% para G210 e de 3,5% para P365.
Heterose sobre os pesos de bovinos Canchim e Aberdeen Angus e de seus cruzamentos recíprocos
PEROTTO, DANIEL;CUBAS, ANTONIO CARLOS;MOLETTA, JOSé LUIZ;LESSKIU, CARLOS;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000001200022
Abstract: the study was conducted to estimate heterosis upon birth weight (pnt), weaning weight (p210), yearling weight (p365) and daily weight gain from birth to weaning (g210) and from weaning to one year of age (g365) in the first, second, third and fourth generations of a rotational crossbreeding system between canchim (c) and aberdeen angus (a). data from 1,147 calves born from 1981 to 1998 were analyzed by least squares procedures fitting a linear model that included the linear and the quadratic effects of age of the dam of the calf plus the fixed effects of sex, genetic group, month and year of birth of calf. estimates of heterosis and of other genetic differences were obtained by linear contrasts of appropriate means and tested by the t test. the contrast ca was positive and significant (p<0.001) for all five traits. the contrast f1caf1ac was negative and highly significant (p<0.001) for p210 and for g210 and significant (p<0.05) for p365. the f1 generation exhibited heterosis of 4.8% for p210 and of 4.9% for g210. maternal heterosis was 3.7%, 5.8%, 6.3% and 20.4%, respectively, for p210, g210, p365 and g365. the heterosis estimated for the mean of the third and fourth generations of the rotational crossbreeding system between c and a was 4.6% for p210, 5.3% for g210 and 3.5% for p365.
Características da carca?a de bovinos Canchim e Aberdeen Angus e de seus cruzamentos recíprocos terminados em confinamento
Perotto, Daniel;Moletta, José Luiz;Cubas, Antonio Carlos;
Ciência Rural , 1999, DOI: 10.1590/S0103-84781999000200024
Abstract: fourteen quantitative carcass traits of 137 canchim; 5/8 charolais + 3/8 zebu, (ca), aberdeen angus (ab), 3/4ca+1/4ab, 3/4ab+1/4ca, 5/8ca+3/8ab and 5/8ab+3/8ca, born at est. exp. fazenda modelo, in ponta grossa-pr, brazil, from 1988 to 1993, were analyzed. averages for age at beginning of confinement, initial weight, length of confinement period, final age and final weight were, respectively, 737 days, 356kg, 97 days, 834 days and 468kg. during the confinement period the animals were fed corn silage ad libitum plus a concentrate ration (79% tdn, 17,8% cp) offered on the basis of 1% of animal live weight per day. the results showed that ca and ab differed with respect to all traits, except side cut percentage. ca was superior to ab for hot carcass weight (pcq), dressing percentage (rcq), area of eye muscle (aol), conformation score, percentage of lean tissue (pem), weight of eatable portion (ppc) and hot carcass weight per day of life at slaughter (pcq/ddv). ab animals had thicker fat cover over rib eye (egc) and higher percentages of fat and of bones in the carcass than ca animals. there was heterotic response for pcq, rcq, aol, ppc and pcq/ddv. the two advanced crisscross ca x ab generations performed better than parental average for pcq, rcq, aol, ppc and pcq/ddv. performance of a rotational ca x ab crossbreeding system would be superior to that of any of the paternal breeds.
Genetic characterization of Aberdeen Angus cattle using molecular markers
Vasconcellos, Luciana Pimentel de Mello Klocker;Tambasco-Talhari, Daniella;Pereira, Andréa Pozzi;Coutinho, Luiz Lehmann;Regitano, Luciana Correia de Almeida;
Genetics and Molecular Biology , 2003, DOI: 10.1590/S1415-47572003000200005
Abstract: aberdeen angus beef cattle from the brazilian herd were studied genetically using restriction fragment length polymorphism (rflp) of the k-casein - hinfi (csn3 - hinfi), b-lactoglobulin - haeiii (lgb - haeiii) and growth hormone alui (gh- alui) genes, as well as four microsatellites (texan15, csfm50, bm1224 and bm7160). the rflp genotypes were determined using the polymerase chain reaction (pcr) followed by digestion with restriction endonucleases and electrophoresis in agarose gels. with the exception of the microsatellite bm7160, which was analyzed in an automatic sequencer, the pcr products were genotyped by silver staining. the allele and genotype frequencies, heterozygosities and gene diversity were estimated. the values for these parameters of variability were comparable to other cattle breeds. the genetic relationship of the aberdeen angus to other breeds (caracu, canchim, charolais, guzerath, gyr, nelore, santa gertrudis and simmental) was investigated using nei's genetic distance. cluster analysis placed the aberdeen angus in an isolated group in the bos taurus breeds branch. this fact is in agreement with the geographic origin of this breed.
Genetic characterization of Aberdeen Angus cattle using molecular markers  [cached]
Vasconcellos Luciana Pimentel de Mello Klocker,Tambasco-Talhari Daniella,Pereira Andréa Pozzi,Coutinho Luiz Lehmann
Genetics and Molecular Biology , 2003,
Abstract: Aberdeen Angus beef cattle from the Brazilian herd were studied genetically using restriction fragment length polymorphism (RFLP) of the kappa-casein - HinfI (CSN3 - HinfI), beta-lactoglobulin - HaeIII (LGB - HaeIII) and growth hormone AluI (GH- AluI) genes, as well as four microsatellites (TEXAN15, CSFM50, BM1224 and BM7160). The RFLP genotypes were determined using the polymerase chain reaction (PCR) followed by digestion with restriction endonucleases and electrophoresis in agarose gels. With the exception of the microsatellite BM7160, which was analyzed in an automatic sequencer, the PCR products were genotyped by silver staining. The allele and genotype frequencies, heterozygosities and gene diversity were estimated. The values for these parameters of variability were comparable to other cattle breeds. The genetic relationship of the Aberdeen Angus to other breeds (Caracu, Canchim, Charolais, Guzerath, Gyr, Nelore, Santa Gertrudis and Simmental) was investigated using Nei's genetic distance. Cluster analysis placed the Aberdeen Angus in an isolated group in the Bos taurus breeds branch. This fact is in agreement with the geographic origin of this breed.
CARCASS CHARACTERISTICS OF ABERDEEN ANGUS STEERS FINISHED IN CULTIVATED PASTURE OR FEEDLOT CARACTERíSTICAS DE CARCA A DE NOVILHOS ABERDEEN ANGUS  [cached]
Fabiano Nunes Vaz,Jo?o Restle,Patrícia Alessandra Meneguzzi Metz,José Luiz Moletta
Ciência Animal Brasileira , 2008,
Abstract: The objective of this work was to study the carcass characteristics of Aberdeen Angus castrated steers, finished by 112 days in feedlot, with sugar cane + concentrate, or in cultivated pasture of ryegrass (Lolium multiflorum). Confined animals were fed with isonitrogeneous diets (13.2% of crude protein) containing, on dry matter, 72.3% of sugar cane and 27.7% of concentrate. Twelve steers, with initial weight of 320 kg and 20 months of age, were used. No difference (P> .05) was observed for slaughter and hot carcass weight that were, respectively, 396 and 202 for steers fed with cultivated pasture and 394 and 201, in the same order, for steers fed with sugar cane. There wasn’t difference (P> .05) between treatments for carcass hot dressing and commercial cuts percentages, carcass length, conformation, fat thickness and longissimus dorsi area. Has significative correlation in two treatments for carcass weight and cushion thickness, conformation and longissimus dorsi area. Steers finished on cultivated pasture the conformation was correlated with all variables. KEY WORDS: Bos taurus, dressing percentage, forage quality, Lolium multiflorum, sugar cane. O objetivo deste trabalho foi estudar as características de carca a de novilhos castrados Aberdeen Angus terminados por 112 dias em confinamento, com cana-de-a úcar + concentrado, ou em pastagem cultivada de azevém (Lolium multiflorum). Alimentaram-se os animais confinados com dietas isonitrogenadas (13,2% de proteína bruta) contendo, na matéria seca, 72,3% de cana-de-a úcar e 27,7% de concentrado. Utilizaram-se doze novilhos, com peso inicial de 320 kg e idade de 20 meses, arranjados num delineamento inteiramente casualizado. N o houve diferen a (P>0,05) nos pesos de fazenda e de carca a quente que foram, respectivamente, de 396 e 202 kg nos novilhos alimentados com pastagem cultivada e de 394 e 201 kg, citados na mesma ordem, para os novilhos alimentados com cana-de-a úcar. N o houve diferen a (P>0,05) entre tratamentos para as variáveis rendimento de carca a quente, percentagem dos cortes comerciais da carca a, comprimento e conforma o de carca a, espessura de gordura de cobertura e área de longissimus dorsi. Houve correla o significativa nos dois grupos de novilhos entre o peso de carca a e as variáveis espessura de cox o, conforma o e área de longissimus dorsi. Os novilhos terminados em pastagem tiveram a conforma o de carca a correlacionada com todas as outras variáveis medidas.
Carcass characteristics and meat quality of Aberdeen Angus steers finished on different pastures
Devincenzi, Thais;Nabinger, Carlos;Cardoso, Fernando Flores;Nalério, élen Silveira;Carassai, Igor Justin;Fedrigo, Jean Kássio;Tarouco, Jaime Urdapilleta;Cardoso, Leandro Lunardini;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000400030
Abstract: the present study was conducted to assess carcass features, physicochemical and sensory parameters of meat from steers finished on three types of pastures: natural pasture; natural pasture improved, fertilized and oversown with winter species; and annual summer grassland. the experiment was conducted from december 14, 2009 to november 30, 2010, with treatments distributed in a completely randomized design with a different number of replicates. animals were used as experimental units. experimental animals were aberdeen angus steers with twenty months of initial age and 354±27.4 kg of live weight, on average. the highest average daily gains were obtained for the annual summer grassland. there was no effect of treatments on carcass conformation. the highest carcass yield was obtained on the improved natural pasture. forequarter yield, side cut yield and longissimus muscle area were similar between the pastures. moisture and total lipids were not affected by the pasture. thawing and cooking losses were higher in improved natural pasture and lower in sorghum pasture. regardless of the treatment, the meat had luminosity ranging from intermediate to dark, high in red, high in yellow, and considered within the normal range for beef. meat of higher shear force was found in natural pasture, and lower shear force was observed in meat from annual summer grassland. average live weight daily gain explained 18% of the shear force. sensory evaluation by duo-trio test showed differences between samples from distinct pastures in flavor. all the studied systems allow for desirable characteristics in carcass and meat.
Consumo e convers o alimentar de machos bovinos inteiros Charolês, Caracu e cruzamentos recíprocos em confinamento  [cached]
Perotto Daniel,Moletta José Luiz,Oliveira Jo?o Everaldo Prestes de,Lesskiu Carlos
Revista Brasileira de Zootecnia , 2000,
Abstract: RESUMO - O consumo diário de matéria seca (CPUPV), a convers o alimentar (CONV) e o ganho de peso médio diário (GMD) de 80 machos bovinos inteiros Charolês (Ch), Caracu (Ca) e seus cruzamentos recíprocos (ChCa e CaCh) gerados pelo cruzamento alternado Ch x Ca foram analisados. Todos os animais foram alimentados em baias individuais por períodos de 76 a 97 dias, quando receberam silagem de milho à vontade e concentrado contendo 17,8% PB e 79% NDT fornecido à base de 1% PV/animal/dia. As três características foram analisadas inicialmente em fun o do período de alimenta o, sendo o período total dividido em três sub-períodos e, posteriormente, no período total. As médias gerais para as três características, considerando-se o período total, foram 2,25 kg de MS/100 kg PV/dia, 6,75 kg MS/kg de GMD e 1,587 kg/dia, respectivamente, para CPUPV, CONV e GMD. Na análise por período, o grupo genético (GPO) influenciou CPUPV e GMD, mas n o a CONV. A intera o GPO x período n o mostrou efeito para qualquer das três características. O Ch superou o Ca para CONV (-0,861 kg de MS/kg de GMD) e GMD (0,163 kg/dia). A diferen a recíproca (ChCa - CaCh) foi significativa para as três características, e o ChCa foi melhor que o CaCh. Houve efeito da heterose sobre o GMD. O cruzamento alternado Ch x Ca igualou-se ao Ch e superou o Ca.
Energia líquida no leite e desempenho de bezerros de vacas primíparas Aberdeen Angus
Lemes,J.S.; Pimentel,M.A.; Brauner,C.C.; Moraes,J.C.F.;
Archivos de Zootecnia , 2011,
Abstract: the availability of net energy in the milk of aberdeen angus primiparous cows and his relationship with the calves performance was studied. fourty seven cows, raised under a range condition, in aceguá. rs county, were evaluated between september 2005 to april 2006. milk production (pl) was estimated by before and after suckle method, from birth to weaning (189days), every 21 days. effects studied were pregnancy (g), and milk production level (npl): npla <1035.70 ± 36.65 kg
Eficiência produtiva em vacas primíparas das ra as Aberdeen Angus e Charolês
Ribeiro Edson Luis de Azambuja,Restle Jo?o,Rocha Marco Ant?nio da,Mizubuti Ivone Yurika
Revista Brasileira de Zootecnia , 2001,
Abstract: Este trabalho foi conduzido com o objetivo de avaliar o desempenho produtivo de vacas de corte. Foram utilizadas 30 vacas da ra a Aberdeen Angus e 32 da ra a Charolês primíparas, prenhes no início do experimento, com bezerros puros ou mesti os Nelore. As vacas foram submetidas a diferentes tratamentos alimentares durante o inverno e a primavera: T1 - pastagem natural, T2 - pastagem cultivada por 60 dias (24 horas/dia), do início de setembro ao início de novembro, T3 - acesso à pastagem cultivada por duas horas diárias, por um período de 60 dias (de início de julho ao início de setembro), T4 - acesso à pastagem cultivada por duas horas diárias, por um período de 60 dias (de início de julho ao início de setembro), e mais 60 dias (24 horas/dia) de pastagem cultivada do início de setembro ao início de novembro. As medidas de eficiência produtiva foram: EPPARTO = (P205/PVP)*100; EPDESMAME = (P205/PVD)*100; EPMBPARTO = (P205/PVP0,75); EPMBDESMAME = (P205/PVD0,75); e EPNDT = NDTTOTAL/P205, em que P205 é o peso ao desmame dos bezerros; PVP e PVD, os pesos das vacas ao parto e ao desmame, respectivamente; e NDTTOTAL, a exigência em energia para manuten o e produ o de leite das vacas. As vacas Aberdeen Angus, com bezerros machos e aquelas com bezerros mesti os, foram mais eficientes. Vacas que utilizaram a pastagem cultivada por um período de tempo maior (T4) tiveram melhor desempenho do que aquelas que permaneceram apenas em pastagem natural(T1); as vacas dos outros tratamentos tiveram desempenhos intermediários.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.