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Titolo:
Profitabilities of some mating systems for dairy herds in New Zealand
Autore:
Lopez-Villalobos, N; Garrick, DJ; Holmes, CW; Blair, HT; Spelman, RJ;
Indirizzi:
Massey Univ, Inst Vet Anim & Biomed Sci, Palmerston North, New Zealand Massey Univ Palmerston North New Zealand Palmerston North, New Zealand
Titolo Testata:
JOURNAL OF DAIRY SCIENCE
fascicolo: 1, volume: 83, anno: 2000,
pagine: 144 - 153
SICI:
0022-0302(200001)83:1<144:POSMSF>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIFFERENT ROUGHAGE CONTENTS; 2 COMPLETE DIETS; MILK-PRODUCTION; JERSEY COWS; CATTLE; PERFORMANCE; EFFICIENCY; PASTURE; BREEDS;
Keywords:
dairy cattle; mating systems; crossbreeding; profitability;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Garrick, DJ Massey Univ, Inst Vet Anim & Biomed Sci, Private Bag 11222, Palmerston North, New Zealand Massey Univ Private Bag 11222 Palmerston NorthNew Zealand d
Citazione:
N. Lopez-Villalobos et al., "Profitabilities of some mating systems for dairy herds in New Zealand", J DAIRY SCI, 83(1), 2000, pp. 144-153

Abstract

The aim of this study was to evaluate the profitability of dairy herds under three mating systems involving the Holstein-Friesian, Jersey, and Ayrshire breeds. Mating systems were straight breeding and rotational crossbreeding using two or three breeds. A deterministic model was developed to simulate the nutritional, biological, and economic performance of dairy herds under New Zealand conditions. Expected performances per cow were obtained using estimates of breed group and heterosis effects, age effects, and age distribution in the herd. Requirements for dry matter in feed were estimated per cow for maintenance, lactation, pregnancy, and growth of the replacements. Stocking rate was calculated by assuming 12,000 kg of dry matter utilizedannually per hectare. Productivity per hectare was calculated as performance per cow multiplied by stocking rate. Profitability was the difference between income (sale of milk and salvage value of animals) and costs (relatedto the number of cows in the herd and the land area farmed). Under currentmarket values for milk and meat, all of the rotational crossbred herds showed superior profitability to the straightbred herds (Holstein-Friesian x Jersey, NZ$505/ha; Holstein-Friesian x Jersey x Ayrshire NZ$493/ha; Jersey xAyrshire, NZ$466/ha; Holstein-Friesian x Ayrshire, NZ$430/ha; Jersey, NZ$430/ha; Holstein-Friesian, NZ$398/ha; and Ayrshire, NZ$338/ha). Changes in the value for fat relative to protein affected profitability more significantly in herds using the Jersey breed, and changes in the value for meat affected profitability more significantly in herds using the Holstein-Friesian and Ayrshire breeds. Results suggested that, under New Zealand conditions, the use of rotational crossbreeding systems could increase profitability ofdairy herds under the conceivable market conditions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:34:31