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Reproduction in the giraffe in relation to some environmental factors

Environmental influences on reproduction in female giraffe were investigated by calculating conception dates for 123 calves and twenty foetal giraffe from the eastern Transvaal, South Africa. Of these, 60% occurred during the 4 months December to March. This period is the peak of the austral summer when plant leaf production is at a maximum, the preferred food species of the giraffe are abundant and the protein and energy content of these are high. Rainfall is also highest at this time.

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Food Selection by Transvaal lowveld giraffe as determined by analysis of stomach contents

Food selection by giraffe in the Transvaal lowveld was studied by identifying plant fragments from stomach contents over a 1 year period. Large fragments were randomly taken from the material while small fragments were taken from a 50 ml sample. Identifications were based on diagnostic keys and over 8000 fragments were classified. The validity of the samples was tested and found to be satisfactory. Giraffe were found to subsist mainly on leaves of trees and shrubs. Fruit, flowers and twigs

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Ovarian progestins in Masai giraffe (Giraffa camelopardalis)

Gonadal progestins from fetal, juvenile, pregnant and non-pregnant Masai giraffe (Giraffa camelopardalis) were extracted, purified by TLC and measured by GLC or by competitive protein-binding assay. Progesterone was found in fetal ovaries and in a fibrotic CL from a nearterm fetus as well as in CL from juvenile animals. In pregnant animals, luteal progesterone probably increased with the duration of gestation. The values of 20β-hydroxyprogesterone were higher in juvenile giraffes than in the fetus or during early pregnancy. No 20β-hydroxyprogesterone

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Giraffa Camelopardalis

An overview on Giraffa camelopardalis including information on diagnosis/general characteristics, distribution, fossil record, form, function, ontogeny and reproduction, ecology, behavior, and genetics.

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Tactile encounters in a herd of captive giraffe

The behavior of the members of the herd of 18 giraffes at Taronga Zoo in Sydney, Australia, was studied for 5 months. The individuals were tolerant of each other, seldom fighting, not even over a receptive female. Sexually active males were the most active in initiating encounters. Calves showed little interest in the adult members of the herd. The 24-year-old male Ml, formerly the dominant male, seldom interacted with the other animals. Nosing and licking were the most common types

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Flehmen

Introduction Flehmen is a behavioral pattern that has been observed in almost all species of ungulates and in some felids. An individual flehmens when it detects an interesting smell — urine, faeces, a female’s vulva or even a chemical substance such as ether or valerian (Schneider, 1930). McHugh (1958) for example reports that wild female bison, Bison bison, have flehmened while nosing a rotten skeleton, human urine, a newborn calf and the torn scrotum of a bull. Usually flehmen occurs

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"Necking" behaviour in the giraffe

Previous references to “necking” behaviour, and the main features of the study area are briefly outlined. “Necking” behaviour in giraffe takes place only in all male herds. When the animals are in a head to head posture the intensity is either high or low, but when animals take up a head to tail posture the actions are always of high intensity and appear to have greater sexual significance. The significance of “necking” is discussed, and it is suggested that these

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