FR 35. Environmental factors effect on seasonality of calving in bufaloes
Abstract
One thousand one hundred seventy three records of births of a buffaloes herd were studied in order to evaluate calving seasonalilty (EP) percentage aforesaid in a very dry tropical environment. It was used a variance analysis and following factors were considered: Enviromental: Years (Y): 1991 (A1); 92 (A2); 93 (A3); 94 (A4); 95 (A5) and 96 (A6); seasons (E): January-April= E1; May-August= E2 and September-December= E3; climatology condition (CC): [temperature (T), precipitation (Pr), humidity (Hr) and hours of daylight (Hl). The results obtained indicated that the (E) and (CC) affected (P<.0001) to (EP). The average for (EP) (1991-1996) was 5.86 % for (E1); 11.54 % for (E2) and 82.77 % for (E3). The average due to the year (A) was: for (A1) = 0.0 % ; 33.10 % and 66.89 % for (E1), (E2) and (E3) respectively ; for (A2)= 5.23 % ; 0.58 % and 94.18 % for (E1), (E2) and (E3) respectively; for (A3)= 10.05 %; 7.10 % and 82.84 % for (E1), (E2) and (E3) respectively; for (A4)= 9.13 %; 10.50 % and 80.36 % for (E1), (E2) and (E3) respectively ; for (A5)= 3.70 %; 6.46 % and 89.81 % for (E1), (E2) and (E3) respectively and for (A6)= 5.95 % ; 11.50 % and 82.53 % for (E1), (E2) and (E3) respectively. It is concluded that from 1991 to 1996 was a marked tendency to natural synchronization of buffaloes at the climatology condition that has taken the calving seasonality (E3).