The Application of Alkali-treated Rice Straw and Sunn Hemp as Alternative Forage for Dairy Goats
Date Issued
2014
Date
2014
Author(s)
Chou, Tsai-Jou
Abstract
Sunn hemp ( SH ) and rice straw ( RS ) are common agriculture cover-crop and by-product in Taiwan. They are high in cell wall carbohydrates and can be incorporated into the diet of dairy goats as a source of energy as well as providing the dietary fiber to ensure normal ruminal function. The alkaline hydrogen peroxide ( AHP ) treatment can increase bacterial colonization and adhesion to fiber particles and increase the rate and extent of fiber digestion in the rumen.
Sodium hydroxide and H2O2 were added to the SH and RS at 5.0% and 2.5% of the dry matter, respectively and then set for 2 weeks. The in vitro dry matter digestion ( IVDMD ) of SH and RS was improved 15% and 63% after AHP treatment. Total gas production, IVDMD and neutral detergent fiber digestion ( IVNDFD ) increased, as the percentage of AHP-treated substrate was elevated in incubation. According to the result of in vitro test, we chosed the ratio of AHP-treated: untreated of SH and RS as 60:40 and 80:20 in dairy goat feeding study.
Six multiparous Alpine goats in mid-lactation were used in two replications of 3 x 3 Latin square design. Each experiment period included 21 day, the first 17 d were used for adjustment to diets followed by 4 d of sample and data collection. There were 3 treatment diets: control ( alfalfa hay, bermudagrass ), rice straw ( alfalfa hay, rice straw ), and sun hemp ( sunn hemp, bermudagrass ). Goats were fed and milked daily at 0700 and 1900 during the trial.
Goats in RS group had the highest dry matter intake ( 2136.0 g/head/day ), but there were no significant different among three treatment groups. The neutral detergent fiber ( NDF ) intake of SH group was less than the other groups. Sunn hemp group had higher dry matter digestibility than rice straw group, however, no significantly different to control group. Rice straw group had the lowest non-fiber carbohydrate digestibility. There was no significant difference observed in milk yields among control, RS and SH groups ( 1962.2, 2034.5, 1737.5 mL/day ), milk composition and N retention among three treatment groups.
In conclusion, there was no negative effect on dry matter intake and performance of dairy goats when replacing alfalfa hay with sunn hemp, or bermudagrass with rice straw. AHP-treatment actually improves the quality of alternative forages. And it proves that, domestic agriculture cover-crop and by-products have potential as the alternative forage for ruminants after pretreatment.
Subjects
鹼處理
副產物
稻草稈
太陽麻乾草
泌乳羊
Type
thesis
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