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Search Results: 1 - 10 of 70062 matches for " SERENO JOSé ROBSON BEZERRA "
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Emergência de Haematobia Irritans nas massas fecais de bovinos das ra?as Nelore e Pantaneira no pantanal mato-grossense
Sereno, Fabiana Tavares Pires de Souza;Sereno, José Robson Bezerra;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000900022
Abstract: this study was carried out at nhumirim farm, property of embrapa-centro de pesquisa agropecuária do pantanal, corumbá, ms, brazil, from 11/93 to 05/94, with manure samples of nelore and pantaneira breeds collected to compare the number of horn flies (haematobia irritans) on manure samples of both bovine breeds. out of the 112 bovine samples collected from each breed, 72 (64.3%) nelore manure samples showed pupa of h. irritans; in pantaneira, out of 105 (94%) manure samples with fly pupas, only 60 (53.6%) exhibited h. irritans. the results of comparative measurements of length, width, height and volume parameters among the manure samples, showed no significant difference (t test - p>0.05) between nelore and pantaneira breeds. the number of fly pupas collected from the manure samples of pantaneira breed (n=2892) was higher than in nelore breed (n=1715) (p<0.05). with relation to h. irritans, a higher number of pupas was observed in the manure samples of pantaneira breed (n=399)(p<0.05) than in nelore breed (n=237). the manure samples of pantaneira also presented a higher (p<0.05) total number of pupas by feces volume. the pantaneira breed showed higher attraction to horn flies.
Cytogenetic and molecular analysis of the Pantaneiro cattle breed
Issa, érica Cunha;Jorge, Wilham;Sereno, José Robson Bezerra;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006001100006
Abstract: the objective of this work was to characterize pantaneiro cattle genetically through its paternal ancestry by the morphology of the y chromosome, whether submetacentric or acrocentric, as well as to identify the maternal ancestry through mitochondrial dna. the karyotype and mitochondrial dna of 12 bulls of pantaneiro breed were analyzed. the y chromosome was analyzed in lymphocyte metaphases and the mitochondrial dna by diagnosing its haplotype (bos taurus and bos indicus). among pantaneiro animals analyzed three had a taurine (submetacentric) y and nine had a zebuine (acrocentric) y chromosome, suggesting breed contamination by zebu cattle, once pantaneiro is considered to be of european origin. the mitochondrial dna was exclusively of taurine origin, indicating that the participation of zebuines in the formation of the breed occurred entirely through the paternal line.
DNA testing for parentage verification in a conservation nucleus of Pantaneiro horse
Sereno, Fabiana Tavares Pires de Souza;Sereno, José Robson Bezerra;Vega-Pla, Jose Luis;Delgado, Juan Vicente;
Genetics and Molecular Biology , 2008, DOI: 10.1590/S1415-47572008000100013
Abstract: we investigated the genealogy of the in situ conservation nucleus of the pantaneiro horse using dna microsatellites by evaluating 101 horses, the group consisting of 71 adult horses (3 stallions, 40 male and 31 mares) and 27 foals (14 colts and 13 fillies). genomic dna was extracted from hair roots and genotyped using 12 microsatellite markers (aht4, aht5, asb2, asb17, asb23, hms3 hms6, hms7, htg4, htg10, lex33 and vhl20). the number of alleles per locus varied from 6 to 13, with a mean of 7.8 and the expected heterozygosity ranged from 0.544 to 0.734 (mean 0.644). the vlh20, asb2, htg10, asb23 markers had a high (> 0.8) polymorphism information content and the total exclusion probability of the 12 microsatellite loci was 0.99. the genealogical study of the pantaneiro horse using genetic markers was efficient in detecting mistakes during paternity and maternity designation and is an important tool which can be used together with traditional systems of animal identification. the use of genetic markers is recommended in the systematic control of the genealogical registrations and conservation plans to improve genetic aspects of the pantaneiro horse.
Veda e vermifuga??o como alternativas de manejo para desmama de bezerros Nelore em pastagem nativa do Pantanal
SERENO, JOSé ROBSON BEZERRA;CATTO, JO?O BATISTA;SILVA, MARTA PEREIRA DA;SERENO, FABIANA TAVARES PIRES DE SOUZA;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000001000023
Abstract: the aim of this study was to investigate the integrated effects of native pastures sealing with strategic control of gastrointestinal nematodes on body development of weaned nellore calves, studied between march 1992 and january 1993 in the pantanal region, brazil. two homogeneous groups of weanling calves were put on contiguous paddocks of native pastures with the same physiognomic characteristics and sealed for three and a half months. the paddock where the non-treated group was put, was previously used by cows that were rearing a calf for contamination of the pasture. the treated group remained with low levels of eggs per gram of feces (egf) during the whole experimental period. in the non-treated group, the egf diminished during the assay, ending with similar levels of the treated group. on body development, it was observed a lower body weight loss of the treated group during the dry season and a compensatory weight gain of the nontreated group on the subsequent rainy season. the mean body weight of the two groups was similar at the end of the trial.
Veda e vermifuga o como alternativas de manejo para desmama de bezerros Nelore em pastagem nativa do Pantanal
SERENO JOSé ROBSON BEZERRA,CATTO JO?O BATISTA,SILVA MARTA PEREIRA DA,SERENO FABIANA TAVARES PIRES DE SOUZA
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Entre mar o de 1992 e janeiro de 1993 realizou-se este estudo com o objetivo de avaliar o efeito integrado da veda do pasto nativo com o controle estratégico de nematóides gastrintestinais no desempenho corporal de bezerros Nelore pós-desmame no Pantanal da Nhecolandia, MS, Brasil. Dois lotes de animais recém-desmamados aos nove meses foram colocados em invernadas contíguas de pastagens nativas com as mesmas características fision micas, que foram vedadas por três meses e meio; a invernada do lote controle foi previamente pastejada por vacas com bezerro ao pé para contamina o. O lote tratado permaneceu com níveis muito baixos de ovos por grama de fezes durante todo o período experimental, e no lote controle foram diminuindo no decorrer do ensaio, terminando semelhantes. No desenvolvimento corporal, observou-se menor perda de peso do lote tratado durante a esta o seca e ganho de peso compensatório do lote controle na esta o chuvosa subseqüente. Os pesos médios dos dois lotes no final do experimento foram semelhantes.
Reduction of the bull: cow ratio in the Brazilian Pantanal
Sereno, José Robson Bezerra;Costa e Silva, Eliane Vianna da;Mores, Cristiano Mougenot;
Pesquisa Agropecuária Brasileira , 2002, DOI: 10.1590/S0100-204X2002001200019
Abstract: this work was conducted to study alternatives for reduction of the bull:cow ratio in the brazilian lowland and, therefore, lower the production costs for the local beef cattle industry. the ratios 1:10, 1:25, and 1:40 were used in native pastures with a mean stocking rate of 0.27 mature animal unit per hectare over two consecutive breeding seasons. statistical analysis did not show any effect (p>0.05) of year (p = 0.2097), animal category (p = 0.0773), bull:cow ratio (0.8134) on reproductive performance. however, the pregnancy rate in a multiple bull system was higher (p = 0.0228) than in the individual bull system. an evaluation of the economic impact of this management system in the extensive lowland herds showed that at the ratio of 1:10 the bulls were sub utilized.
Reduction of the bull: cow ratio in the Brazilian Pantanal
Sereno José Robson Bezerra,Costa e Silva Eliane Vianna da,Mores Cristiano Mougenot
Pesquisa Agropecuária Brasileira , 2002,
Abstract: This work was conducted to study alternatives for reduction of the bull:cow ratio in the Brazilian lowland and, therefore, lower the production costs for the local beef cattle industry. The ratios 1:10, 1:25, and 1:40 were used in native pastures with a mean stocking rate of 0.27 mature animal unit per hectare over two consecutive breeding seasons. Statistical analysis did not show any effect (P>0.05) of year (P = 0.2097), animal category (P = 0.0773), bull:cow ratio (0.8134) on reproductive performance. However, the pregnancy rate in a multiple bull system was higher (P = 0.0228) than in the individual bull system. An evaluation of the economic impact of this management system in the extensive Lowland herds showed that at the ratio of 1:10 the bulls were sub utilized.
Estimativa de la edad y peso a la primera monta de novillas en el Pantanal brasile o
Sereno José Robson Bezerra,Pellegrin Aiesca Oliveira,Lara Maria Aparecida Cassiano,Abreu Urbano Gomes Pinto de
Pesquisa Agropecuária Brasileira , 2001,
Abstract: Esto trabajo tuvo como objetivo estimar la edad y peso a la primera monta de novillas de las razas Nelore (N), Pantaneira (P) y Mestizas Pantaneira x Nelore (PxN). Se utilizó un total de 98 hembras, siendo 51, 24 y 23 pertenecientes a las razas N, P y PxN, respectivamente. El análisis estadístico de los datos no reveló diferencia significativa (P = 0,3595) para el peso a la primera monta entre las razas estudiadas. El análisis de varianza no reveló diferencia significativa (P = 0,307) entre las edades a la primera monta entre razas, mostrando 3,5, 3,4 y 3,2 a os para las novillas P, N y PxN, respectivamente.
Weight and age at puberty and their correlations with morphometric measurements in crossbred breed Suffolk ewe lambs
Ferra, Janine de Campos;Cieslak, Silvia;Sartori Filho, Roberto;McManus, Connie;Martins, Carlos Frederico;Sereno, José Robson Bezerra;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000100018
Abstract: the objective of this study was to identify and to correlate parameters that characterize puberty and estimate the age and weight of suffolk ewe lambs in mato grosso do sul. this study was carried out with twenty-two suffolk ewe lambs for 256 days. blood samples were collected from the jugular vein and centrifugated and the plasma were stored at -20°c until analysis of progesterone (p4) concentration by radioimmunoassay (ria). the morphometric measurements included: head length and width, body length, elbow height, chest perimeter, back-sternal diameter, croup length, width and height, cannon bone perimeter and shoulder and hip width, using a tape. the animals became pubertal when the plasma progesterone concentration was >1.0 ng/ml, at 34.1 ± 5.2 kg and 39.5 ± 8.5 weeks of age. meanwhile, the lambs that did not reach puberty (37.7 ± 11.4 weeks of age) were lighter. the morphometric measurements has medium to low correlations with age and weight at puberty.
Genetic diversity of Brazilian Pantaneiro horse and relationships among horse breeds
Sereno, Fabiana Tavares Pires de Souza;Sereno, José Robson Bezerra;Vega-Pla, Jose Luis;Kelly, Lucy;Bermejo, Juan Vicente Delgado;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000500007
Abstract: the objective of this work was to evaluate the genetic diversity of brazilian pantaneiro horse by microsatellite markers, investigate the effect of genetic bottlenecks and estimate genetic differentiation among four horse breeds. genetic variation was estimated through allele frequencies and mean breed heterozygosity. nei's genetic distances among the breeds pantaneiro, thoroughbred, arabian, spanish pure breed (andalusian), and uruguay creole were calculated, and it was used to construct an upgma dendrogram. clustering at different k values was calculated to infer population structure and assign individuals to populations. nei's distances showed a minimum distance between pantaneiro horse and spanish pure breed (0.228), and similar distances from spanish pure breed to thoroughbred and to arabian (0.355 and 0.332). it was observed a great level of diversity, clear distance from pantaneiro horse to other breeds, and genetic uniformity within breed. it was verified a certain level of substructure of pantaneiro horse showing no influences from the other studied breeds.
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