Seasonal effects on gestation length and birth weight in alpacas

Gestation lengths and birth weights were measured in 162 pregnancies in alpacas ( Lama pacos) farmed in the high country of the South Island of New Zealand. A comparison of pregnancies from spring (mid-October to mid-December) and autumn (mid-February to late April) matings showed that gestation len...

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Veröffentlicht in:Animal reproduction science 1997-04, Vol.46 (3), p.297-303
Hauptverfasser: Davis, G.H., Dodds, K.G., Moore, G.H., Bruce, G.D.
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container_title Animal reproduction science
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creator Davis, G.H.
Dodds, K.G.
Moore, G.H.
Bruce, G.D.
description Gestation lengths and birth weights were measured in 162 pregnancies in alpacas ( Lama pacos) farmed in the high country of the South Island of New Zealand. A comparison of pregnancies from spring (mid-October to mid-December) and autumn (mid-February to late April) matings showed that gestation lengths were 12.5 days longer in spring (348.9 ± 1.4 days vs. 336.4 ± 1.2 days; P < 0.0001). For each day later in spring that a female was mated there was an increase in gestation length of 0.11 days ( P < 0.05), whereas for each day later in autumn the gestation was reduced by 0.24 days. There were no significant effects of sex of cria or age of dam on gestation length. After adjustment for gestation length, crias born in autumn weighed 1.0 kg more than those born in spring (8.8 ± 0.15 kg vs. 7.8 ± 0.18 kg; P < 0.001). Female crias weighed 0.4 kg less than males at birth ( P < 0.05). The results suggest that in this environment it will be difficult to maintain spring-mated females in a 12 month breeding cycle.
doi_str_mv 10.1016/S0378-4320(96)01611-9
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source MEDLINE; Elsevier ScienceDirect Journals
subjects ALPACA
ALPACAS
ALPAGA
Animals
Animals, Newborn - physiology
BIRTH WEIGHT
Birth Weight - physiology
Camelids, New World - physiology
Female
GESTACION
GESTATION
GESTATION PERIOD
Gestational Age
Male
PERIODE DE GESTATION
PERIODO DE GESTACION
PESO AL NACIMIENTO
POIDS A LA NAISSANCE
PREGNANCY
Pregnancy, Animal - physiology
Seasonal dynamics
SEASONAL VARIATION
Seasons
Sex Characteristics
VARIACION ESTACIONAL
VARIATION SAISONNIERE
title Seasonal effects on gestation length and birth weight in alpacas
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