Teses em Ciência Animal (Doutorado) - PPGCAN/Castanhal
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/4665
O Doutorado em Ciência Animal teve início em 2008, com início da primeira turma em 2009 junto à CAPES/MEC e funciona no Programa de Pós-Graduação em Ciência Animal (PPGCAN) do Campus Universitário de Castanhal (CCAST) da Universidade Federal do Pará (UFPA), Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) e Universidade Federal Rural da Amazônia (UFRA).
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Item Acesso aberto (Open Access) Características fenotípicas e manejo genético de búfalos (Bubalus bubalis) leiteiros: ranqueamento de reprodutores(Universidade Federal do Pará, 2015-08-10) MARQUES, Larissa Coelho; MARQUES, José Ribamar Felipe; http://lattes.cnpq.br/0104908318773676The buffalo is an animal that can compete with differentiated products on internal and world markets, which presents own features and great performance when processing by-products and derivatives. Despite this, buffalo agribusiness resents of enhancers animals proved and / or tested to meet a demand that is vital for better genetic pattern. This study aimed to evaluate phenotypic characteristics of production milk and reproduction efficient of buffalo and perform genetic analyzes determining parameters and genetic index aimed at selection of buffalo to prepare a ranking of genetically superior breeding, increasing production chain of buffaloes in the Amazon region. We used 2,459 phenotypic records of Murrah, Mediterranean and half-blood buffaloes of EMBRAPA - CPATU herd from period between 1953 to 2013. The characteristics evaluated were: total milk production (TMP), fat percentage (F), age at first calving (AFC), calving interval (CI) and service period (SP). The descriptive analysis began with the editing of the data worked in the environments of Excel spreadsheet and SAS package. The overall results were: TMP = 1741.00 ± 496.48 kg, F = 7.07 ± 0.86%, AFC = 49.39 ± 7.37 months, CI = 13.16 ± 0.79 months and SP = 91.52 ± 24,22 days. In the analysis of variance for TMP the most significant effects were the birth order and the degree of blood from female, and to F was degree of female blood and AFC was calving season and birth order and CI and SP were station childbirth and the calf sex. The phenotypic correlations between TMP and F was 0.034, between TMP and AFC 0.118, between TMP and CI 0.070, between TMP and SP 0.070, between F and AFC -0.113, between F and CI -0.025, -0.025 between F and SP, among AFC and CI 0.445, 0.445 between AFC and SP and between CI and SP 1.00. Genetic analysis began with the editing of the data discussed in the environments of Excel spreadsheet and the SAS package and genetic analyzes were performed by WOMBAT software. For estimation of genetic parameters we used the animal model with two-trait analysis. The TMP was regressed depending on length of lactation and the regression coefficient was used for correction of lactation in 305 days (PL305). Fixed effects were contemporary group and linear and quadratic effects of birth female age as (co) variable. AFC and SP model was the same as described above with the exclusion of the term of the maternal permanent environmental effect. The heritability estimates for Murrah were: 0.49 for TMP; 0.59 for F; 0.75 for AFC; 0.006 for CI and 0.06 for SP; for the Mediterranean race were 0.31 for TMP; 0.08 for F; 0.78 for AFC; 0.90 for CI and 0.90 for SP. Genetic correlations between TMP and other features in the Murrah were 0.065 TMP and F; TMP and AFC 0.097, -0.450 TMP and CI and 0.079 TMP and SP for the Mediterranean were: -0.267 TMP and F; 0,629 TMP and AFC; 0.559 TMP and CI and 0.624 CI TMP and SP. The ranking of bulls / breeding was based on predictions of probable transmission ability (PTA's), using the SAS package which allows editing a bulls catalog of buffalo species of EMBRAPA Amazônia Oriental in that period. Based on the results the variability of the studied herd is likely to be crafted with the genetic management for both production characteristics as to the reproductive efficiency.