Heterosis in the components of lactation curves of Girolando cows
| Autor: | João Cláudio do Carmo Panetto, Juliana Dementshuk Machado, Luis Telo da Gama, Darlene dos Santos Daltro, Alessandro Haiduck Padilha, Marcos Vinícius Gualberto Barbosa da Silva, José Braccini Neto, Jaime Araujo Cobuci |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
040301 veterinary sciences
Heterosis biology.animal_breed persistency of lactation 0403 veterinary science Animal science Mathematical model Cross-breeding Lactation Persistency of lactation medicine Curva de Lactação dairy cows Vaca leiteira lcsh:SF1-1100 Modelo matemático biology 0402 animal and dairy science Dairy cows Lactação 04 agricultural and veterinary sciences 040201 dairy & animal science cross-breeding Girolando cattle medicine.anatomical_structure Vigor hibrido Animal Science and Zoology Cruzamento animal lcsh:Animal culture mathematical model |
| Zdroj: | Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Italian Journal of Animal Science, Vol 18, Iss 1, Pp 267-278 (2019) |
| Popis: | The objective of this study was to evaluate the effect of heterosis on the lactation curve components of Girolando cattle obtained by fitting different mathematical models. Data consisted of 258,891 test day milk yield records of the first lactation from 37,965 cows of Minas Gerais State (Brazil) between 1998 and 2014. Those cows were from the Holstein breed (H), Gyr breed (G) and six genetic cross-breedings of Holstein × Gyr, (1/4H, 3/4G (1/4H); 3/8H, 5/8G (3/8H); 1/2H, 1/2G (1/2H), 5/8H, 3/8G (5/8H); 3/4H, 1/4G (3/4H); 7/8H, 1/8G (7/8H)), which is officially named as Girolando breed in Brazil. The Wood’s linear model (WDlin), Wood’s non-linear model (WDnlin), Wilmink’s model (WL) and Ali and Schaeffer’s model (ASH) were used for estimating the peak milk yield (PY), time to peak yield (PT), 305-day milk yield (TMY) and four different persistency measures (P, P2:1, P3:1 and P3:2). Regardless of the fitted model, the highest estimates of PY and TMY were for the H group. The heterosis effect was significant (p |
| Databáze: | OpenAIRE |
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