Wyniki wyszukiwania

1

Age structure and sex ratio in population of harvested feral pigs in New Zealand

100%

Dzieciolowski R. M., Clarke C. M. H.

Acta Theriologica

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1989

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tom 34

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nr 29-43

2

Physical condition and ectoparasite infestation of feral pigs in New Zealand

100%

Dzieciolowski R. M., Clarke C. M. H.

Acta Theriologica

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1990

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tom 35

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nr 3-4

3

Reproductive characteristics of feral pigs in New Zealand

80%

Dzieciolowski R. M., Clarke C. M. H., Frampton C. M.

Acta Theriologica

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1992

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tom 37

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nr 3

Breeding was studied in feral pigs Sus scrofa Linnaeus, 1758 inhabiting the northern part of the South Island, New Zealand. In a sample of 1,117 female pigs 50.4% showed evidence (pregnancy or lactation) that they were breeding. There was no statistically significant regional variation in the breeding status of females. Breeding occurred throughout the year with birth peaks in July-November and March. Among 101 females 5-8 months old, 30 (29.7%) were pregnant. The oldest breeding sow was 14 years old. Breeding females up to 17 months old were significantly heavier than non-breeding females, but the difference ceased to be significant for older animals. Pregnant females averaged 6.2 foetuses (range 1 - 11). Lactating females had on average 5.4 teats extended (range 1 - 12). For areas where pigs are considered a pest species a simulation model predicted a population recovery time of 30 months from a 70% kill.

Ograniczanie wyników

3 Acta Theriologica

3 Clarke C. M. H.

3 Dzieciolowski R. M.

1 Frampton C. M.

1 1992

1 1990

1 1989

Age structure and sex ratio in population of harvested feral pigs in New Zealand

Physical condition and ectoparasite infestation of feral pigs in New Zealand

Reproductive characteristics of feral pigs in New Zealand