Forage and animal responses to ammoniation of coastal bermudagrass hays of different maturities /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1988.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Coastal bermudagrass (Cynodon dactylon (L) Pers) was harvested at 3, 6 and 12 wk of regrowth age, field dried to approximately 20% moisture, and either stored in a barn or ammoniated with 4% (w/w) anhydrous ammonia. Additionally, the 6 wk regrowth was ammoniated with 4% (w/w) after field drying to a 28% "high moisture" level. The hays were fed ad libitum as long hays twice daily to six Braham steers (avg wt 340 kg) with esophageal and ruminal cannulae and to seven yearling heifers (avg wt 270 kg). Moisture level (27.8 vs 19.9%) at ammoniation of the 6 wk regrowth hay did not affect (P>.05) composition or the digestibility of any entity, the voluntary daily intake of hay dry matter (VI) or of neutral detergent fiber (VINDF). The mean retaining aperture (MRa) of particulate matter and packed particle volume (PPV) of particles of the masticate, ruminal digesta and the fecal particles from the 6 wk regrowth hays was not affected by the moisture content at ammoniation. Ammoniation of hays with 20% moisture resulted in an increased (P<.05) content of crude protein (CP) and decreased content of neutral detergent (NDF) and indigestible neutral detergent fiber (INDF). Reductions in NDF content were largely due to reductions in the difficulty hydrolysable hernicellulose (DHH) and cellulose (CELL). Acid detergent lignin (ADL) and easily hemicellulose (DHH) and cellulose (CELL). Acid detergent lignin (ADL) and easily hydrolyzable hemicellulose (EHH) content of the dry matter was not affected by ammoniation. Ammoniation increased the voluntary intake (VI) of the 6 and 12 wk regrowth hays (P<.05), but did not affect VI of the 3 wk regrowth hay. The mean retaining aperture (MRA) of masticated particles for the 6 wk regrowth hay was greater than the MRA of masticated particles originated from hay of 3 or 12 wk regrowth hays (P<.05), but did not affect VI of the 3 wk regrowth hay. The mean retaining aperture (MRA) of masticated particles for the 6 wk regrowth hay was greater than the MRA of masticated particles originated from hays of 3 to 12 wk regrowth age. Ammoniation increased (P<.05) the MRA of ruminal digest particles and the MRA of ruminal digest particles tended to increase with regrowth age... |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Nutrition." |
| Physical Description: | xv, 147 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |