Foram estimados os coeficientes de herdabilidade e a mudança genética para peso à desmama (PD), ao sobreano (PS), ganho do nascimento (GND), da (GDS), perímetro escrotal (PE) idade primeiro parto (IPP) em animais raça Nelore. utilizados dados 128.148 nascidos entre 1984 2006. Os componentes variância foram pelo método máxima verossimilhança restrita, valores genéticos preditos por modelos mistos aplicando-se modelo animal bicaracterística, incluindo todas as análises. As tendências genéticas...

The objectives of this study were to estimate the genetic parameters for milk yield unadjusted and adjusted days in and, subsequently, assess influence adjusting on sire rank. Complete lactations from 90 or 150 lactation 270 350 considered these analyses. Milk was by multiplicative correction factors, including length as a covariable model. yields different procedures traits. Heritability estimates varied 0.17 0.28. Genetic correlation between greater than 0.82. Adjusting affected parameter...

Mozzarella cheese is traditionally prepared from bubaline (Bubalus bubalis) milk, but product adulteration occurs mainly by addition of or full substitution bovine milk. The aim this study was to show the usefulnes molecular markers identify admixture milk during manufacturing process mozzarella cheese. Samples were produced adding seven different concentrations milk: 0%, 1%, 2%, 5%, 8%, 12% and 100%. DNA extracted somatic cells found in submitted PCR-RFLP analysis casein genes: α-s1-CN -...

Genetic parameters for test-day milk flow (TDMF) of 2175 first lactations Holstein cows were estimated using multiple-trait and repeatability models. The models included the direct additive genetic effect as a random contemporary group (defined year month test) age cow at calving (linear quadratic effect) fixed effects. For model, in addition to effects cited, permanent environmental animal was also effect. Variance components restricted maximum likelihood method single- analyses....

We analyzed 75,555 test-day milk flow records from 2175 primiparous Holstein cows that calved between 1997 and 2005.Milk was obtained by dividing the mean yield (kg) of 3 daily milking total time (min) expressed as kg/min.Milk grouped into 43 weekly classes.The analyses were performed using a single-trait Random Regression Models included direct additive genetic, permanent environmental, residual random effects.In addition, contemporary group linear quadratic effects cow age at calving fixed...

Improving feed efficiency is a key breeding goal in the beef cattle industry. In this study, we estimated genetic parameters for and carcass traits Senepol raised tropical regions. Various indicators of [gain to ratio (G:F), conversion (FCR), residual weight gain (RG), intake body (RIG), (RFI)] as well growth [final BW, average daily (ADG), DM (DMI)], [rib-eye area (REA), backfat thickness (BF), intramuscular fat score, conformation score] were included study. After data editing, records...

ABSTRACT The objective of this study was to determine factors affecting phenotypic characteristics related milk production and reproductive efficiency dairy buffalo. Phenotypic records 2,459 Murrah, Mediterranean crossbred buffaloes from the Embrapa Eastern Amazônia herd, 1969 2013 were used. Traits included: total during lactation (TMP), corrected for 305 days (P305); cow weight at calving (CW), fat percentage (F), age first (AFC), interval (CI), calf birth (BW), as well (LP) service...

Insulin growth factor I (IGF-I) and prolactin (PRL) are peptide hormones that exert complementary effects on reproductive traits by acting folliculogenesis. In view of the lack information about IGF-I PRL genes in Bos indicus, objective this study was to partially characterize promoter regions these screen animals different ages at first pregnancy for presence polymorphisms regions. addition, we determined whether influence regulation two hormone genes, evaluating their association with...

Foram utilizados 138.976 registros de informações pesos corporais variando 60 a 610 dias idade, provenientes 27.327 animais da raça Nelore, oriundos rebanhos do estado Mato Grosso, com o objetivo descrever variabilidade genética e estimar parâmetros genéticos para peso corporal em diferentes idades, utilizando-se modelos regressão aleatória. O modelo empregado incluiu efeitos fixos grupo contemporâneos idade vaca ao parto como covariáveis, além aleatórios genético aditivo direto, materno,...

ABSTRACT The objective of this study was to evaluate genetic aspects related production and reproductive efficiency Murrah Mediterranean buffaloes their crosses. A ranking bulls from Embrapa Eastern Amazonia also composed guide assisted mating. Birth records 2,322 Murrah, Mediterranean, crossbred the Amazon herd, 1953 2013, as well information on traits were used. Genetic analyzes performed in WOMBAT software using animal model with two-trait analysis. While heritability (h2) for total milk...

The aim of this study was to estimate the best covariance function structure, by means Legendre polynomials using random regression models (RRM) describe genetic variability weight growth trajectory quails and parameters. Body records animals at 7, 14, 21, 28, 35, 42 days age were used. orders fit gradually increased in from 3 6 for comparison between Akaike information criteria included fixed effects contemporary group, coefficient on polynomial, coefficients direct additive genetic,...

The objectives of this study were to estimate genetic parameters for unadjusted and adjusted milk production 270 305 days lactation and, subsequently, verify the coincidence rank 2%, 5%, 20% 40% best sires selected based on both models. Complete lactations from 90 or 150 350 considered in analyses. Milk was length by multiplicative correction factors, including as a covariable model. Heritabilities, correlations breeding values estimated each trait, variance covariance components restricted...

Conjugated Linoleic Acids (CLAs) comprise a family of positional and geometric isomers linoleic acid. The main form CLA, cis-9, trans-11-C18:2 show positive effects in cancer prevention treatment. major dietary sources these fatty acids are derived from ruminant animals, particular dairy products. In the endogenous synthesis mainly occurs mammary gland by action enzyme Stearoyl CoA Desaturase (SCD). Different levels expression activity SCD can explain partially variation CLA fat milk....

RESUMO Utilizaram-se registros de pesos corporais padronizados aos 120, 210, 365 e 450 dias idade, provenientes 30.481 animais da raça Nelore, progênies 211 reprodutores acasalados com 19.229 matrizes, oriundos rebanhos dos estados Mato Grosso, Grosso do Sul Goiás, o objetivo avaliar a presença interação genótipo x ambiente entre os estados. As estimativas herdabilidade variaram 0,09 0,14; 0,11 0,17; 0,16 0,27 0,17 0,35, respectivamente, para idade. correlação genética aditiva mesma...

RESUMO: Objetivou-se avaliar as características microbiológicas do leite cru produzido em algumas propriedades município de Parintins-AM.Realizou-se análise Cluster, na qual foram formados três grupos, nomeados A, B e C, seguida da estatística descritiva.Todos os grupos apresentaram contaminação por coliformes termotolerantes, com médias 708, 322,1 780 NMP mL -1 para respectivamente.As leveduras, UFC , 2,1 × 10 3 no grupo 2,5 1,0 4 o enquanto que bolores 4,5 1 13,0 5,0 C. A presença...

Mozzarella cheese is traditionally prepared from bubaline (Bubalus bubalis) milk, but product adulteration occurs mainly by addition of or full substitution bovine milk. The aim this study was to show the usefulnes molecular markers identify admixture milk during manufacturing process mozzarella cheese. Samples were produced adding seven different concentrations milk: 0%, 1%, 2%, 5%, 8%, 12% and 100%. DNA extracted somatic cells found in submitted PCR-RFLP analysis casein genes: α-s1-CN -...