Identification and phenotypic characterization of genetic groups of the girolando breed in dairy herds of the state of Roraima
| Autor: | L. F. F. Salgado, D. F. R. Frias |
|---|---|
| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Boletim de Indústria Animal, Vol 77, Pp 1-10 (2020) |
| Druh dokumentu: | article |
| ISSN: | 0067-9615 1981-4100 |
| DOI: | 10.17523/bia.2020.v77.e1485 |
| Popis: | Dairy farming in the state of Roraima, Brazil, is majorly supported by Holstein x Gir crossbred cattle, which are more adapted to the tropical climate and traditional production systems. However, there is a need to adapt the genetic groups to production systems and raise awareness of the importance of using visual phenotypic assessments as an auxiliary tool in obtaining and selecting animals. This study proposes to identify the frequency and characterize the phenotype of the ¼ Hol + ¾ Gir; ⅜ Hol + ⅝ Gir; ½ Hol + ½ Gir; ⅝ Hol + ⅜ Gir; ¾ Hol + ¼ Gir; and ⅞ Hol + ⅛ Gir genetic groups of the Girolando breed in herds in the state of Roraima. Data were obtained from visual morphological evaluations to identify the genetic groups and characterize the phenotype of the animals from August 2016 to February 2017. According to the evaluations, the frequency distribution of the genetic groups was as follows: 210 (21.26%) of the ¼ Hol + ¾ Gir group; 145 (14.68%) of the ⅜ Hol + ⅝ Gir group; 249 (25.20%) of the ½ Hol ½ Gir group; 166 (16.80%) of the ⅝ Hol + ⅜ Gir group; 126 (12.75%) of the ¾ Hol + ¼ Gir group; and 92 (9.3%) of the ⅞ Hol + ⅛ Gir group. In the phenotypic evaluations, statistically significant differences (p |
| Databáze: | Directory of Open Access Journals |
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