Threatened Goat Breeds from the Tropics: The Impact of Crossbreeding with Foreign Goats

Ribeiro, M. N.; Rocha, Leandro Branco; Carvalho, Francisco Fernando Ramos de; Costa, Roberto Germano; Arandas, Janaína Kelli Gomes; Ribeiro, Neila Lidiany

doi:10.1007/978-3-319-71855-2_7

Cited by 4 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides being used for food and as income sources, they play crucial socio-cultural roles and are an integral part of the production system (Devendra, 2013). Goats are also key players in the resilience and adaptability of farmers to adverse conditions (Ribeiro et al, 2018). There is, therefore, a need to genetically improve goats for higher productivity.…”

Section: Introductionmentioning

confidence: 99%

Timing and Extent of Inbreeding in African Goats

et al. 2019

View full text Add to dashboard Cite

Genetic characterization of African goats is one of the current priorities in the improvement of goats in the continent. This study contributes to the characterization effort by determining the levels and number of generations to common ancestors (“age”) associated with inbreeding in African goat breeds and identifies regions that contain copy number variation mistyped as being homozygous. Illumina 50k single nucleotide polymorphism genotype data for 608 goats from 31 breeds were used to compute the level and age of inbreeding at both local (marker) and global levels (F G ) using a model-based approach based on a hidden Markov model. Runs of homozygosity (ROH) segments detected using the Viterbi algorithm led to ROH-based inbreeding coefficients for all ROH (F ROH ) and for ROH longer than 2 Mb (F ROH > 2Mb ). Some of the genomic regions identified as having ROH are likely to be hemizygous regions (copy number deletions) mistyped as homozygous regions. Although the proportion of these miscalled ROH is small and does not substantially affect estimates of levels of inbreeding for individual animals, the inbreeding metrics were adjusted by removing these regions from the ROH. All the inbreeding metrics varied widely across breeds, with overall means of 0.0408, 0.0370, and 0.0691 and medians of 0.0125, 0.0098, and 0.0366 for F ROH , F ROH > 2Mb , and F G , respectively. Several breeds (including Menabe and Sofia from Madagascar) had high proportions of recent inbreeding, while Small East African, Ethiopian, and most of the West African breeds (including West African Dwarf) had more ancient inbreeding.

show abstract

Section: Introductionmentioning

confidence: 99%

Timing and Extent of Inbreeding in African Goats

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Another risk factor is that in the last years, the introduction of highly specialized foreign breeds in the Brazilian herds has caused a fast replacement and genetic erosion of the local ones, as observed by [ 6 ] and [ 7 ]. This situation requires conservation programs to protect the remaining genetic diversity in these local populations.…”

Section: Introductionmentioning

confidence: 99%

Diversity Analysis and Genetic Relationships among Local Brazilian Goat Breeds Using SSR Markers

Menezes

Martínez-Martínez

Filho

et al. 2020

Animals

View full text Add to dashboard Cite

The genetic diversity of six Brazilian native goats was reported using molecular markers. Hair samples of 332 animals were collected from different goat breeds (Moxotó, Canindé, Serrana Azul, Marota, Repartida, and Graúna) from five states of Northeast Brazil (Paraíba, Pernambuco, Rio Grande do Norte, Bahia, and Piauí). A panel of 27 microsatellites or single sequence repeats (SSRs) were selected and amplified using a polymerase chain reaction (PCR) technique. All populations showed an average allele number of over six. The mean observed heterozygosity for Brazilian breeds was superior to 0.50. These results demonstrated the high genetic diversity in the studied populations with values ranging from 0.53 (Serrana Azul) to 0.62 (Repartida). The expected average heterozygosity followed the same trend ranging from 0.58 (Serrana Azul) to 0.65 (Repartida), and the values obtained are very similar for all six breeds. The fixation index (Fis) had values under 10% except for the Moxotó breed (13%). The mean expected heterozygosity of all Brazilian populations was over 0.50. Results indicated a within-breed genetic variability in the Brazilian breeds based on the average number of alleles and the average observed heterozygosity. The interbreed genetic diversity values showed proper genetic differentiation among local Brazilian goat breeds.

show abstract