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Biology - Reproduction

Age specific fecundity

Average- Fecundity

Figure 3: Average Fecundity for adult female buffalo over a range of rainfall

Taylor (1985) found the average fecundity for adult female buffalo in Matusadona was 0.7 calves (of both sexes) per adult female per year. This indicates a calving interval of 17.2 months, i.e. post-partum anoestrus lasts for about 6 months. This rate of calving is very high and implies two calves every three years (which is in fact what the Matusadona population achieved). The only higher rate of calving in the literature is that of 0.8 calves per year (i.e. 4 calves every 5 years) recorded by Sinclair (1977) for the Serengeti in East Africa. Taylor (1985, p377) gives the results of several studies of buffalo from different parts of Africa under rainfall conditions varying from 400-1200 mm per year and concludes that there is a strong relationship between rainfall and fecundity in arid and semi-arid areas (Fig.5)

This relationship has been used to estimate average fecundities for buffalo over the range of rainfall in Namibia where buffalo might occur:

Annual Rainfall (mm)
200
300
400
500
600
700
Average Fecundity
0.288
0.343
0.397
0.452
0.507
0.563

Age specific fecundity

A multiplier has been used to adjust the average fecundity for each age class. The results are shown below for an average fecundity of 0.5, i.e. one calf every two years (the average is calculated over the ages 6-16 years).

AGE 1 2 3 4 5 6 7 8 9
Multiplier 0.00 0.00 0.00 0.10 0.32 0.79 1.10 1.20 1.30
Fecundity 0.00 0.00 0.00 0.05 0.16 0.40 0.55 0.60 0.65

AGE 10 11 12 13 14 15 16 17 18
Multiplier 1.40 1.30 1.20 1.10 1.00 0.50 0.25 0.00 0.00
Fecundity 0.70 0.65 0.60 0.55 0.50 0.25 0.13 0.00 0.00

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