The practicality and profitability of feed inputs on the Stratford Demonstration Farm
A four-herd dairy farm farmlet trial was carried out on the Stratford Demonstration Farm in Central Taranaki for four seasons (2001/2002 to 2004/2005). This trial examined the profitability and practicality of different feed input systems including on-farm forage cropping and the use of new pastures. The farmlets included: 1. A self-contained control group moderately stocked at 3.3 Jersey cows/ha. 2. A group with the same stocking rate (SR) but using high quality silage made on the farmlet to allow milking for a long lactation (280 days/cow) and feed purchased to balance the winter feed budget (MPF). 3. A group, high stocked at 4 Jersey cows/ha to allow direct grazing of the grass by milking cows with minimal supplements made but feed purchased (grass silage and hay, maize silage, winter grazingoff) to allow a moderate to long lactation length (270 days/cow) and to balance the winter feed budget (HPF). 4. A group also at the moderate SR and self-contained but with 12% of the farmlet cropped with summer turnips and Triticale cereal silage crops to increase total feed production, as well as introduce the use of higher quality pasture cultivars (crop). Increased milk production was achieved by the increased inputs with a response rate of 142 g milksolids (MS)/kg dry matter (DM) from buying-in feed to extend the lactation and 84 g MS/kg DM from buying-in feed to run a higher SR. The cropping and regrassing system also resulted in a 4.9% increase in MS production, but crop yields were much lower than expected, significantly affecting the results. The MPF group with purchased feed to extend the lactation produced the best economic result under the costs and milk payouts used. The HPF group produced the most variable and lowest economic result. The extra milk production from this group was sufficient to cover the extra feed costs but not the cost of running the extra cows. The extra milk production on the cropping farmlet covered the cost of the cropping and allowed a high level of regrassing at no net cost, but minimal economic benefit. The value of the new pastures in the system, however, improved each season. Labour costs, feed costs and milk payout are critical factors in the differing economic results. These vary greatly from farm-to-farm, and year-to-year and differences here can change the relative economics of each system. Keywords: economic farm surplus, feed input systems, milksolids production, profit