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Hormonal induction of twinning in farmed red deer (Cervus elaphus): comparative mortality and growth of twins and singles to weaning

Published online by Cambridge University Press:  02 September 2010

P. F. Fennessy ,
G. H. Moore  and
R. P. Littlejohn
P. F. Fennessy
Affiliation:
MAF Technology, Invermay Agricultural Centre, Mosgiel, New Zealand
G. H. Moore
Affiliation:
MAF Technology, Invermay Agricultural Centre, Mosgiel, New Zealand
R. P. Littlejohn
Affiliation:
MAF Technology, Invermay Agricultural Centre, Mosgiel, New Zealand
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Abstract

Multiple births were induced in 20 hinds subjected to a progesterone plus gonadotropin treatment to advance the breeding season by about 4 to 5 weeks. In total, over 2 years, 92 hinds were treated and run with melatonin-treated stags. Of the 59 hinds that calved to the induced oestrus, 39 produced single calves, 19 produced twins and one produced triplets. Birth weight, gestation length, perinatal mortality and growth rate to weaning at ca. 20 weeks of age were compared for singles and twins. There was a significant effect of birth type on birth weight with twins being proportionately 0·30 lighter than singles (6·27 and 8-94 kg; P < 0·001), with a significant interaction between the birth weight of a calf and the sex of its co-twin (P < 0·05); males born as co-twins to females were proportionately 0·18 heavier than their co-twin females (P < 0·06), while in contrast twin male sets were substantially lighter than twin female sets. Gestation lengths were similar for both singles and twins, with significant negative relationships between gestation length and birth weight for both singles and twins, with a 2-day decrease in gestation length for a 1-kg increase in mean birth weight. There was a strong quadratic relationship between perinatal survival and birth weight; the expected mortality rates at 5, 8 and 11 kg birth weight derived from the relationship were 0·39, 0·11 and 0·39 respectively, indicating reduced probability of survival at both low and high birth weights. The regression relationships between weaning weight or growth rate to weaning and birth weight indicate that at the same birth weight, twin-reared calves were about 5 kg lighter than singles at 20 weeks, while an extra 1 kg weight at birth was associated with an extra 2 kg weight at 20 weeks.

Keywords

growth ratePMSGprogesteronered deertwinning
Type
Research Article
Information
Animal Production , Volume 51 , Issue 3 , December 1990 , pp. 623 - 630
Copyright
Copyright © British Society of Animal Science 1990

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