Examining the impacts of red deer hind body condition score and pasture forage mass on calf weaning weight
D. R. Stevens A B , B. R. Thompson A , G. W. Asher A and I. C. Scott A
+ Author Affiliations
- Author Affiliations
A AgResearch, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand.
B Corresponding author. Email: david.stevens@agresearch.co.nz
Animal Production Science 57(3) 466-472 https://doi.org/10.1071/AN15342
Submitted: 3 July 2015 Accepted: 12 December 2015 Published: 20 April 2016
Abstract
The effect of pre-calving hind body condition and the interaction with pasture forage mass during lactation on calf growth and intake to weaning were investigated. Two-hundred and forty red deer hinds (Cervus elaphus scoticus × hippelaphus) of average body condition score (BCS) 3.5 were subjected to either ad libitum or restricted feeding for the 4 weeks before the expected start of calving (31 October) to create hinds of low (2.5) or high (3.5) BCS. The hinds were then grazed continuously on pasture of either low (<1200 kg DM/ha) or high (>2400 kg DM/ha) forage mass during lactation (29 October–25 March). In a 2 × 2 crossover design liveweight, liveweight gain and pasture intake were measured in both hinds and calves. Low hind body condition score (BCS 2.5) at the onset of lactation resulted in low calf weaning weight (46.9 kg) when forage mass was low, but not when forage mass was high (57.3 kg). High BCS (3.5) in hinds resulted in intermediate calf weaning weight when on low forage mass (51.2 kg) and high calf weaning weight when forage mass was high (56.6 kg). Both BCS and forage mass influenced calculated total milk production.
Additional keywords: body reserves, gestation, lactation.
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