Abstract #M98
Section: Breeding and Genetics (posters)
Session: Breeding and Genetics I
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Exhibit Hall A
Session: Breeding and Genetics I
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Exhibit Hall A
# M98
Genetics of functional traits related to resistance of diseases and milk yield in Friesian × Bunaji crosses.
Iyetunde Adedibu1, Alex Mshelia1, Adetunji Iyiola-Tunji2, Peter Barje3, Clarence Lakpini3, Tolulope O. Ososanya*4, 1Ahmadu Bello University, Zaria, Kaduna State, Nigeria, 2National Agricultural Extension and Rural Liaison Services, Zaria, Kaduna State, Nigeria, 3National Animal Production Research Institute, Shika, Kaduna State, Nigeria, 4University of Ibadan, Ibadan, Oyo State, Nigeria.
Key Words: functional trait, milk yield, selection
Genetics of functional traits related to resistance of diseases and milk yield in Friesian × Bunaji crosses.
Iyetunde Adedibu1, Alex Mshelia1, Adetunji Iyiola-Tunji2, Peter Barje3, Clarence Lakpini3, Tolulope O. Ososanya*4, 1Ahmadu Bello University, Zaria, Kaduna State, Nigeria, 2National Agricultural Extension and Rural Liaison Services, Zaria, Kaduna State, Nigeria, 3National Animal Production Research Institute, Shika, Kaduna State, Nigeria, 4University of Ibadan, Ibadan, Oyo State, Nigeria.
This study estimated the relationship between milk yield and health trait indicators in F1 (50:50) and F2 (75:25) Friesian × Bunaji crosses (F×B) of cows. The data were collected from 500 F1 and F2 F×B cows on which routine standard measures: vaccinations, control of ecto- and endo- parasites were carried out. The data were collected between 2000 and 2017. The F1 showed significantly (P < 0.01) positive genetic correlation (rg) between milk yield (MY) and lameness (LM) and between MY, foot and mouth disease (FM). The LM was significant (P < 0.01) and moderately positive rg with skin ulcer (SU); helminths (HM); FM and skin rashes (SR). Mastitis had significantly (P < 0.05) low positive rg with HM and SR. There was only significant (P < 0.05) phenotypic relationship (rp) between MY and FM but negative. The rp between SU and mastitis, SU and LM, SU and HM were highly significant (P < 0.01) and highly positive. The F2 showed significant (P < 0.01) moderate positive rg between MY and LM as well as between MY with FM. LM had significant (P < 0.01) moderate positive rg with HM, SU, SR and FM. There were moderate significant (P < 0.05) rp between MY and LM, MY and FM. The SR and HM had highly significant (P < 0.01) positive rp. Selection of F1 F×B cows for improved MY can also benefit from genetic selection against FM and LM due to antagonistic pleiotropic effect. Selection against incidence mastitis may lead to selection of cows with low resistance to ecto- and endo-parasitic incidences. The F1 F×B cows that were high milk producers in this study were likely to have lower incidences of FM. Selection of the F2 F×B cows for improved MY can be undertaken and would aid selection for population with lower incidences of LM and FM. Pleotropic gene effect could have influenced LM, HM, SU, SR and FM in the F2 indicating that selection can be effectively utilized to improve these health traits. In the F2, the quantity of MY may not be affected by the traits LM and FM. In the F1 and F2 F×B cows, genetic relationships exist between MY and common dairy disease traits like LM and FM thus can be selected against at the onset of any breeding program.
Key Words: functional trait, milk yield, selection
