Show simple item record

dc.contributor.authorJarman, Jen_US
dc.contributor.authorKay, Jen_US
dc.contributor.authorNeal, Men_US
dc.contributor.authorDonaghy, Den_US
dc.contributor.authorTozer, Pen_US
dc.date.accessioned2020-12-08T19:17:18Z
dc.date.available2020en_US
dc.date.available2020-12-08T19:17:18Z
dc.date.issued2020en_US
dc.identifier.citationNew Zealand Journal of Animal Science and Production, 2020, 80 pp. 143 - 149en_US
dc.identifier.urihttp://hdl.handle.net/10179/15878
dc.description.abstractRecent changes to pasture-supply curves in South Taranaki, and the availability of winter milk premiums have increased farmer interest in changing from a spring-calving to an autumn-calving farm system. One approach to changing the season of calving from spring to autumn is to extend the calving interval (CI) by delaying the mating period by ~8 months, so that they next calve in autumn and undertake an extended lactation [>305 days in milk (DIM)]. A large-scale farmlet experiment was established in South Taranaki to investigate the production and reproduction responses of cows using this approach. In June 2017, 602 springcalving cows were allocated to two farmlets. In one farmlet (SPR) 301 cows were mated in October to maintain a 12-month CI spring-calving pattern. In the other farmlet (AUT, n=301 cows), mating was delayed for eight months, and cows underwent an extended lactation (mean DIM, 488; max DIM, 577) to calve next in autumn 2019. The experiment analysed two lactations for the AUT farmlet and two and a half lactations for the SPR farmlet. Across the total experimental period, milksolids (MS) production was similar between farmlets (1,194 vs. 1,174 kg MS/cow), however, cows in the AUT farmlet were fed more supplementary feed [2,371 vs. 1,951 kg dry matter (DM)/cow]. The extended lactation changed the relationship between feed supply and herd demand, which led to excessive BCS gain and ryegrass staggers for AUT farmlet cows. Further research is required to examine grazing management during extended lactations and to assess the economic implications of this approach.en_US
dc.format.extent143 - 149en_US
dc.rights(CC BY-NC-ND 4.0)en_US
dc.sourceNew Zealand Society of Animal Science and Productionen_US
dc.titleImplications of using an extended lactation to change from a spring-calving to an autumn-calving farm system in South Taranakien_US
dc.typeConference Paper
dc.citation.volume80en_US
dc.description.confidentialfalseen_US
dc.identifier.elements-id436095
dc.relation.isPartOfNew Zealand Journal of Animal Science and Productionen_US
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
dc.identifier.harvestedMassey_Dark
pubs.notesNot knownen_US


Files in this item

Icon

This item appears in the following Collection(s)

Show simple item record