Comparison of feeding value of rhodesgrass [Chloris gayana], green panic [Panicum maximum] and italian ryegrass [Lolium multiflorum] hays on the basis of milk production.
1990
Miaki T. | Tanaka S. | Kawamura O. | Ohashi T. | Yamauchi K. | Haga S. | Hamakawa H. | Katayama H. | Misumi M.
Rhodesgrass (Chloris gayana Kunth. cv. Katambora), green panic (Panicum maximum Jacq. var. trichoglume cv. Petrie) and Italian ryegrass (Lolium multiflorum Lam. cv. Wasehikari) hays were prepared at the heading stage. To evaluate the feeding value of these hays for lactating cows, two feeding trials (Rhodesgrass vs. Italian ryegrass, and green panic vs. Italian ryegrass) were carried out by switch-back design with 3 periods of each 21 days duration. The Holstein cows were fed the hays ad libitum, with 1 kg of concentrate per 5 kg of actual milk per cow daily. The main results obtained were as follows: (1) The experimental hays were average in quality, but Italian ryegrass hay had slightly lower leaf content than the two other hays. Green panic hay contained more DCP and TDN than the two other hays. Italian ryegrass hay was lowest in DCP content and also Rhodesgrass hay in TDN content. (2) The hay dry matter consumption was greater for green panic hay than for the two other hays, whose consumptions were similar. (3) The cows fed the green panic hay produced significantly more than the cows fed Italian ryegrass hay, on the other hand, the cows fed the latter hay produced significantly more milk than the cows fed Rhodesgrass hay. (4) Milk fat content was significantly higher for the cows fed Rhodesgrass or green panic hays than for the cows fed Italian ryegrass hay. (5) The concentrations of ruminal ammonia of cows fed Italian ryegrass hay were significantly lower than those of cows fed the two other hays.
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