Readings of rectal temperatures and milk production were taken in 1997 and 1998 on 1,484 cows of Carora breed and cross breed belonging to 9 farms in the North-West of Venezuela. 21,819 ambient temperature measurements were also carried out and used in the THI index. The average of the dairy production in the morning was 5.982.72 liters and 5.482.64 liters in the evening. The general average was 5.712.69 liters. The average rectal temperatures in the morning and in the evening were respectively 38.40.45C and 38.82.64C with a total average of 38.60.49C. The production of milk is influenced significantly by the variables "milking", "number of lactations", "days of lactation", "days of gestation" and "type of farm". The hereditability is 0.077, which represents a value largely lower than that quoted in the literature.
Genetic and environmental factors influencing the production of Carora dairy cattle in North-West of Venezuela / A. Cefis, R.M. Rizzi, E. Thys - In: Animal health : a breakpoint in economic development ? The 11th International Conference of the Association of Institutions for Tropical Veterinary Medicine and 16th Veterinary Association Malaysia Congress, 23-27 August 2004, Petaling Jaya, Malaysia / Association of Institutions for Tropical Veterinary Medicine, Veterinary Association Malaysia ; [a cura di] C.T.N.F. Iskandar, L. Hassan, G.K. Dhaliwal, R. Yusoff, A.R. Omar, M.A.K.G. Khan, G.Y. Meng, J. Abu, S.S. Arshad, N. bin Salim, S.A. Aziz, H.M. Daud, S.O.A. Rahman. - Serdang : Universiti Putra Malaysia Press, 2004. - ISBN 983-2871-66-2. - pp. 221-223 (( Intervento presentato al 11. AITVM, 16. VAM. convegno International Conference of the Association of Institutions for Tropical Veterinary Medicine and 16th Veterinary Association Malaysia Congress tenutosi a Petaling Jaya nel 2004.
Genetic and environmental factors influencing the production of Carora dairy cattle in North-West of Venezuela
A. CefisPrimo
;R.M. RizziSecondo
;
2004
Abstract
Readings of rectal temperatures and milk production were taken in 1997 and 1998 on 1,484 cows of Carora breed and cross breed belonging to 9 farms in the North-West of Venezuela. 21,819 ambient temperature measurements were also carried out and used in the THI index. The average of the dairy production in the morning was 5.982.72 liters and 5.482.64 liters in the evening. The general average was 5.712.69 liters. The average rectal temperatures in the morning and in the evening were respectively 38.40.45C and 38.82.64C with a total average of 38.60.49C. The production of milk is influenced significantly by the variables "milking", "number of lactations", "days of lactation", "days of gestation" and "type of farm". The hereditability is 0.077, which represents a value largely lower than that quoted in the literature.
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