Agricultural research in the New Zealand Ministry of Agriculture and Fisheries. Annual report of Research Division 1976-77.
Continuing work on the following subjects is reported:Ruakura Animal Research Station. (1) A comparison of performance testing of Southdown rams with progeny testing using New Zealand Romney (NZR) ewes; (2) a progeny-test comparison of selected and commercial rams; (3) ovulation rate as a selection criterion for fertility in sheep; (4) the improvement of NZR sheep by selection; (5) comparisons of (a) the calving performance of Hereford and Aberdeen-Angus (AA) cows mated with Maine-Anjou, Simmental, Charolais, Aquitaine Blond (AB), South Devon (SD), Limousin, Chiana, Friesian, Hereford, AA and Jersey sires, (b) the growth of the calves and (c) the reproductive performance of the F1 females ; (6) a comparison of the growth performance of AA and AB X AA calves; (7) selection and crossbreeding with AA and Hereford cows; (8) multiplication and evaluation of imported Finnish Landrace (FL), German Whiteheaded Mutton and Oxford Down sheep; (9) selection for improved lambing performance in NZR, Border Leicester (BL) and BL X NZR sheep; (10) a comparison of imported superfine-wooled and local strong-wooled Merinos and their crossbreds and backcrosses with the NZR; (11) a comparison of dairy performance in Jerseys and Friesian-Jersey crossbreds; (12) beef production from dairy herds using Friesian, Hereford, Simmental, AA, Limousin, SD, BA, Red Devon and Charolais sires; (13) selection for growth rate in mice; (14) joint selection for body weight and tail length in mice; (15) selection for postweaning gain in mice; (16) the use of computer simulations to formulate optional breeding methods for sheep, cattle and pigs; (17) breed X stocking rate interaction for reproductive performance, lamb growth and wool production; (18) selection for resistance and susceptibility to bloat in cattle; (19) selection of rams for resistance and susceptibility of their progeny to bloat.Whatawhata Hill Country Research Station. (1) A comparison of 9 NZR and BL X NZR lines selected for various growth, fleece and reproductive traits; (2) a comparison of the performance of 7 sheep breeds under hill conditions; (3) a scheme designed to breed large numbers of NZR rams of high breeding value for use by the Department of Lands and Survey; (4) a comparison of the productivity of Friesian, Friesian X Jersey, Friesian X (Friesian X Jersey), Friesian X AA and AA cows as producers of beef calves under hill conditions; (5) a comparison of the Friesian, Hereford, Simmental and AA as sires of beef breeding cows produced from Friesian dams; (6) a scheme to produce AA bulls of high breeding value for use by the Department of Lands and Survey; (7) the use of objective wool evaluation methods in selection and breed comparison experiments; (8) evaluation of wools produced by exotic sheep breeds and their crosses with the NZR; (9) survival and wool production in Merino X Longwool, NZR and Merino sheep that have been feral for more than or equal to 40 yr; (10) breed X stocking rate interaction for wool production in NZR, Coopworth and Perendale sheep; (11) a comparison of wool production in sheep shorn once and twice yearly.Wallaceville Animal Research Centre. Reproductive hormone levels in red deer hinds.Templeton Agricultural Research Station. (1) A comparison of ewe performance, lamb growth and wool production in NZR, Coopworth, Dorset Horn and Poll Dorset flocks; (2) a comparison of the performance of NZR, Corriedale, Dorset and crossbred ewes mated with Southdown, Suffolk, BL and Dorset Down rams; (3) the growth of lambs sired by Southdown, Suffolk, BL and DD rams; (4) a comparison of 11 local and exotic breeds for crossbred beef production.Invermay Agricultural Research Centre. (1) A comparison of growth rate, wool production and reproductive performance in NZR and Booroola (high-fertility Merino) X NZR sheep; (2) reproductive performance and wool production in NZR, Coopworth and Perendale ewes at 2 stocking rates; (3) the reproductive performance of red deer.Tara Hills High Country Research Station. (1) The use of Booroola Merino rams to increase the fecundity of Merino ewes; (2) a comparison of AA, Hereford, Friesian, Friesian X Hereford and Friesian X AA cows as dams of beef calves.Woodlands Research Station. A comparison of reproductive performance and wool production in NZR, BL, Cheviot and Merino ewes and crossbreds of these breeds with Southdown, Suffolk, Hampshire, Dorset Horn and Poll Dorset rams.Abstracts of other work appear below.