Bruno Bastos Teixeira

Desempenho de codornas de corte submetidas a diferentes níveis de proteína bruta e energia metabolizável

Objetivou-se avaliar o desempenho de codornas de corte, submetidas a diferentes niveis de proteina bruta (PB) e energia metabolizavel (EM). Avaliaram-se 720 codornas distribuidas em delineamento em blocos ao acaso, em esquema fatorial (5x3), com cinco niveis de PB (18, 20, 22, 24 e 26%) e tres niveis de EM (2700, 2900 e 3100kcal kg-1). As analises foram realizadas utilizando-se o programa SAEG (2007). No periodo inicial, houve efeito quadratico da PB e EM sobre o consumo de racao (CR), efeito quadratico da PB e linear da EM sobre o peso corporal (PC), efeito linear da interacao EM e PB sobre o ganho de peso (GP) e conversao alimentar (CA). No crescimento, efeito quadratico da EM e PB sobre o CR, efeito linear da EM e PB sobre o PC e CA, efeito quadratico da PB e linear da EM sobre o GP. Na terminacao, efeito linear da EM e PB sobre o CR, PC e CA, efeito linear e quadratico da EM e PB sobre GP. Na fase inicial, recomenda-se 26% de PB e 3100kcal EM kg-1. Para a fase de crescimento, sugere-se 3100kcal EM kg-1 e 23% de PB, ja, para a fase de terminacao, recomenda-se 26% de PB e 3100kcal EM kg-1.

Estimação dos componentes de variância para as características de produção e de qualidade de ovos em matrizes de codorna de corte

Data from two genetic groups UFV1 and UFV2 of meat-type quail, with 629 animals the first file and 707 the second, were evaluated by technique main components. The following characteristics were considered for analyses: bird weight (P1, P2, P3 and P4), egg average weight (POM1, POM2, POM3 and POM4), shell average weight (PCM1, PCM2, PCM3 and PCM4), yolk average weight (PGM1, PGM2, PGM3 and PGM4), egg average specific gravity (DM1, DM2, DM3 and DM4), egg average width (LOM1, LOM2, LOM3 and LOM4), egg average length (COM1, COM2, COM3 and COM4), number of eggs (N1, N2, N3 and N4), and age at the first egg (IDPO). After data collecting were carried analyses of the main components out with the aim to select the most explanatory characteristics. Next the highest significant characteristics in total variance had their genetic parameters and genetic correlations estimated. For genetic group UFV1 were: P1, PCM1, PCM3, PGM1, PGM2, PGM4, DM4, LOM2, LOM3, COM1 and IDPO. For UFV2: P1, P2, PCM1, PCM4, DM3, LOM2 and LOM4. The high estimates of heritability capacity found indicate a high variability for the characteristics of egg quality. The genetic correlations indicate the possibility of correlation between body weight gains and the quality of eggs. Little response to selection for egg production can be expected for these genetic groups.

Herdabilidade de características de produção e postura em matrizes de codornas de corte

The objective of this study to determine the heritability of characteristics of productive and reproductive performance of different genetic groups of arrays of meat quails, estimating genetic parameters using univariate analyzes. We evaluated two genetic groups (UFV1 and UFV2) in the period 2006 to 2009, being accompanied by five generations, totaling 2136 arrays. Quail were weighed at birth, 7, 14, 21, 28, 35, 42, 77, 112 and 147 days of age. We evaluated each quail eggs were collected for three consecutive days, during four periods of 35 days and measured the width and length of eggs, yolk weight, albumen and shell. We evaluated the specific gravity of eggs and measured the rate of overall posture and age at first egg. Univariate analyzes were performed to estimate the variance components, using the method of restricted maximum likelihood using the program and calculated the MTDFREML hedabilidades. For the quality of eggs heritability values were moderate to high (0.13 to 0.55), high values for growth (0.64 to 0.68) and moderate to high for egg shape (0.10 to 0.57). Heritability estimates for egg quality found indicate a high genetic variability for both genetic groups. As for the weights indicated that selection within the population could result in increases in weight by selection based on individual information. For the characteristics of an egg shape, the heritability values suggest the possibility of genetic groups that meet a standard shape.

Modelos de regressão aleatória para avaliação da curva de crescimento em matrizes de codorna de corte

The objective was to compare different random regression models using Legendre polynomial functions of different orders, to evaluate what best fits the genetic study of the growth curve of meat quails. It was evaluated data from 2136 cut dies quail, of which 1026 belonged to genetic group UFV1 and 1110 the group UFV2. Quail were weighed at 10, 70, 140, 210, 280, 350, 420, 770, 1120 and 1470 days of age, and weights used for the analysis. It was tested two possible modeling of heterogeneous residual variance, which was grouped into three five age classes. After, it was studied the random regression mode, which is better applied to the growth curve quail. The comparison between models was made by the Akaike Information Criterion (AIC), Bayesian Information Criterion of Schwarz (BIC), logarithm of the likelihood function (Loge L) and the likelihood ratio test (LRT), at 1%. The model which considered the heterogeneity of residual variance CL3 was adequate to UFV1 lineage and the lineage model CL5 UFV2. A Legendre polynomial with order 5, for direct genetic effect and 5 for the permanent animal to UFV1 bloodline and order 3 for direct genetic effect and 5 for the permanent animal for UFV2 bloodline should be used in genetic evaluation of the growth curve of meat quails.

Modelos de regressão aleatória na seleção de codornas de corte para produção de ovos

The objective of this work was to evaluate random regression models with different orders of Legendre polynomials, as to the best fit for egg production of meat‑type quails. UFV1 and UFV2 genetic groups of meat‑type quails, from different origins, of the genetic breeding program of the Universidade Federal de Vicosa, Brazil, were evaluated. Egg production was determined weekly for 1,294 quails, from their 6th to their 57th week of age, of which 644 were from the genetic group UFV1, and 650 from UFV2. The animal model was used in random regression by Wombat software, and, for modeling variable trajectories in time, the Legendres polynomial functions were applied. Comparisons were made by the Akaikes information criterion, the Bayesian information criterion of Schwarz, the logarithm of the likelihood function, and the likelihood ratio test. The model with K = 3, for fixed effects, Ka = 4, for genetic effects, and Kc = 4, for the effect of environment provides the best fit, do not causes major changes in the variance components, and provides better estimates of heritability.

Características quantitativas em matrizes de codorna de corte através de análises multicaracterística

The aim of this paper to evaluate the productive and reproductive performance of different strains of meat-type quail hens, estimating the genetic parameters measured. Two groups were evaluated genetic and UFV2 UFV1 matrix quail cutting, with 1110 being the first animal and second with 1026. Multivariate analysis were conducted using the methodology of principal components to define the most important variables. Then, two-trait analysis to estimate covariances and genetic correlations of traits. The characteristics of the analysis were: weight of the bird (P0, P7, P14, P21, P28, P35, P42, P77, P112 and P147), average egg weight (POM1, POM2, and POM3 POM4), average weight of the shell ( PCM1, pcm2, and PCM3 PCM4), average weight of yolk (PGM1, PGM2, and PGM3 PGM4), weight of albumen (PAM1, PAM2, and PAM3 PAM4), average egg specific gravity (DM1, DM2, DM3 and DM4 ), average width of the egg (LOM1, LOM2, and LOM3 LOM4), average length of egg (COM1, COM2, COM3 and COM4), eggs (N1, N2, N3 and N4), total egg production (TXT) and age at first egg (IDPO). For the group of genetic UFV1, an increase in weight of birds may result in an early and that IDPO to select for increased body weight of birds does not result in significant losses in egg quality. As for UFV2, a selection made at 35 days can identify the most weight matrices throughout the production cycle, and do not generate large losses in total egg production.

Utilização de dados parciais na seleção de codornas de corte para produção de ovos

The objective of this work was to verify the possibility of using partial data in the selection of meat-type quail for egg production. The genetic groups UFV1 and UFV2 of meat-type quails, which are from different origins were evaluated. Information from 1,632 mothers, of which 816 from UFV1 and 816 from UFV2 genetic group, was used. The genetic parameters were obtained at the partial periods from the 6th to 24th (P24), 32th (P32), 40th (P40) and 48th (P48) weeks, and at the total period of egg production (P52), from the 6th to 52th week. The components of variance and covariance and the genetic parameters were estimated by restricted maximum likelihood, using a univariate animal model. The partial and total production of eggs were estimated by the multivariate animal model through the Wombat application. For UFV1, the heritability values were: 0.09, P24; 0.09, P32; 0.09, P40; 0.08, P48; and 0.07 for P52; and the genetic correlations ranged from 0.79 to 0.99. For UFV2, the heritability values were: 0.09 for P24; 0.09, P32; 0.10, P40; 0.11, P48; and 0.13 for P52; and correlations ranged from 0.70 to 0.99. For UFV1 selection, it is recommended to consider egg production up to 40 weeks, and for UFV2 selection, egg production until the 48th week. The low heritability estimates suggest that management changes should be done in order to control environmental effects.