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Cool-season annual pastures with clovers to supplement wintering beef cows nursing calves

Journal of Animal Science and Biotechnology 2012年第4期3卷 221-226页

作者： Stacey A Gunter Whitney A Whitworth T Gregory Montgomery Paul A Beck United States Department of Agriculture Agricultural Research Service Southern Plains Range Research Station University of Arkansas at Monticello Division of Agriculture Southeast Research & Extension Center University of Arkansas Division of Agriculture Southwest Research & Extension Center University of Arkansas

In December of 3 years, 87 beef cows with nursing calves （.594 ± 9.8 kg; calving season, September to November） at side were stratified by body condition score, body weight, cow age, and calf gender and divided randomly into 6 groups assigned to 1 of 6 cool-season annual pastures （0.45 ha/cow） that had been interseeded into a dormant common bermudagrass （Cynodon dactylon [L.] Pers.）/bahiagrass （Paspalum notatum Flugge） sod. Pastures contained 1 of the following 3 seeding mixtures （2 pastures/mixture）： 1） wheat （Triticum aestivurn L.） and ryegrass （Lofium multiflorum Lain., WRG）, 2） wheat and ryegrass plus red clover （Trifolium pretense L, WRR）, or 3） wheat and ryegrass plus white （Trifofium repens L.） and crimson clovers （Trifolium incarnatum L., WRW）. All groups had ad libitum access to grass hay （12% crude protein; 58% total digestible nutrients）. The second week in December, cow estrous cycles were synchronized and artificially inseminated. In late December, a bull was placed with each group for 60-d. Data were analyzed with an analysis of variance using a mixed model containing treatment as the fixed effect and year as the random effect. Body weight and condition scores did not differ （P ≥ 0.27） among cows between February and June. Calf birth weights or average daily gain did not differ （P≥ 0.17） among treatments; however, calves grazing pastures with clovers did tend （P= 0.06） to weigh more than calves grazing grass only. Weaning weight per cow exposed to a bull was greater （P= 0.02） for WRR and WRW than WRG. Cows grazing winter-annual pastures containing clovers tended to wean more calf body weight per cow exposed to a bull than cows grazing the grass only pastures.

关键词： annual ryegrass Beef cows Clovers Nitrogen Pasture 1

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Winter Overseeding Zoysiagrass Sports Turf with Cool-Season Turfgrasses in the Southern China

Winter Overseeding Zoysiagrass Sports Turf with Cool-Season ...

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中国草学会青年工作委员会学术研讨会

作者： ZHANG Juming LUO Jing ZHANG Jing LIN Shanshan MO Shixu LU Lijiuan (South Grass Research Center of South China Agricultural University,Guangzhou 510642,China)

The effects of four cool-season turfgrasses and four seeding rates of each species on winter -spring quality and subsequent transition of‘Lanyin Ⅲ’zoysiagrass(Zoysia japonica)sports turf were conducted in Guangzhou,*** results demonstrated that higher overseeding rates can provide greater winter-spring quality but do not enhance the transition to zoysiagrass over lower overseeding *** ryegrass(Lolium multiflorum)transited to zoysiagrass bet- ter than perennial ryegrass(Lolium perenne),but the overseeded winter-spring quality of an- nual ryegrass was *** ryegrass was too persistent to fully transit to zoysia- grass even under high summer *** blurgrass(Poa trivialis)appeared not suit- able for overseeding due to its weakness in competition and the difference in appearance com- pared with *** fescue(Fescue arundinacea)was found to be the best species for winter overseeding on the zoysiagrass turf among the four cool-season turfgrasses studied be- cause of its moderate competition in spring and the similarity inappearance with zoysiagrass. After evaluation of‘Lanyin Ⅲ’zoysiagrass sports turf overseeded with tall fescue from winter to spring,it is suggested that winter overseeding rates of tall fescue should be between 20-30g m .

关键词： ‘Lanyin Ⅲ’zoysiagrass transition annual ryegrass perennial ryegrass rough bluegrass tall fescue green up winter dormancy

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