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Titolo:
Genotype x environment interactions for postweaning performance in crossbred calves grazing winter wheat pasture or dormant native prairie
Autore:
Phillips, WA; Brown, MA; Brown, AH; Coleman, SW;
Indirizzi:
USDA ARS, Grazinglands Res Lab, El Reno, OK 73036 USA USDA ARS El Reno OKUSA 73036 Grazinglands Res Lab, El Reno, OK 73036 USA Univ Arkansas, Fayetteville, AR 72701 USA Univ Arkansas Fayetteville AR USA 72701 ansas, Fayetteville, AR 72701 USA
Titolo Testata:
JOURNAL OF ANIMAL SCIENCE
fascicolo: 6, volume: 79, anno: 2001,
pagine: 1370 - 1377
SICI:
0021-8812(200106)79:6<1370:GXEIFP>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TALL FESCUE PASTURES; BELGIAN BLUE BULLS; CARCASS TRAITS; COMPENSATORY GROWTH; BEEF-CATTLE; COMMON BERMUDAGRASS; FEEDLOT PERFORMANCE; DIFFERENT PERIODS; NITROGEN-BALANCE; STEERS;
Keywords:
Brahman; carcass quality; feedlots; heterosis; maternal effects;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Phillips, WA USDA ARS, Grazinglands Res Lab, 7207 W Cheyenne St, El Reno, OK 73036 USA USDA ARS 7207 W Cheyenne St El Reno OK USA 73036 OK 73036 USA
Citazione:
W.A. Phillips et al., "Genotype x environment interactions for postweaning performance in crossbred calves grazing winter wheat pasture or dormant native prairie", J ANIM SCI, 79(6), 2001, pp. 1370-1377

Abstract

Data from 403 calves from Angus, Brahman, and reciprocal-cross cows sired by Polled Hereford bulls were used to evaluate the impact of postweaning backgrounding forages on postweaning BW, gains, and carcass traits. Calves were born (spring of 1991 through 1994) and reared on either endophyte-infected tall fescue or common bermudagrass pastures. After meaning, calves were transported 360 km to the Grazinglands Research Laboratory, west of El Reno, Op, and, within breed and preweaning forage, were assigned to one of the following winter stocker treatments: l)winter wheat pasture or 2) dormant native prairie plus supplemental CP. In March, winter stocker treatments were ended and calves were grazed as a single group on cool-season grasses until early July (1992; 1993, and 1994) or late May (1995), when the feedlot phase began. In the feedlot, calves were fed a high concentrate diet for an average of 120 d until a backfat thickness of > 10 mm was reached. Calves were shipped in truck load lots to Amarillo, TX (350 km), for processing andcollection of carcass data. Averaged over calf breed group, calves wintered on wheat pasture gained faster (P < 0.01) during the stocker phase (0.71 vs 0.43 kg); had heavier (P < 0.01) final feedlot weights (535 vs 512 kg); lower feedlot (P < 0.01) ADG (1.37 vs 1.53 kg); heavier (P < 0.01) carcass weights (337 vs 315 kg); larger (P < 0.01) longissimus muscle (84.9 vs 81.8cm(2)); higher percentage (P < 0.01) of kidney, heart, and pelvic fat (2.32 vs 2.26); and higher (P < 0.01) dressing percentage (62.2 vs 61.3) than calves backgrounded on native prairie. Maternal heterosis for stocker ADG was evident in calves backgrounded on native prairie but not on winter wheat (P <less than> 0.10), but the two environments were similar in maternal heterosis for feedlot ADG and carcass traits. Calves wintered on native prairie were restricted in growth and expressed compensatory gain during the feedlot phase but not during the spring stocker phase. Dormant native grasses can be used to winter stocker calves excess to the winter wheat pasture needs, but ownership of these calves would have to be retained through the feedlot phase to realize any advantage of built-in compensatory gain. Finally, these data suggest that expression of maternal heterosis for weight gain ismore likely in calves backgrounded on native prairie than in calves grazedon winter wheat.

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Documento generato il 30/09/20 alle ore 09:21:10