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All Journal Majalah Ilmiah Peternakan JITPI : Jurnal Ilmu Dan Teknologi Peternakan Indonesia (Indonesian Journal of Animal Science and Technology)
J.V. NOLAN
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Effects of High Ambient Temperature and Bypass Protein Supplementation on Performance of Crossbred Lambs Dahlanuddin Dahlanuddin; C.J. Thwaites; J.V. Nolan
Jurnal Ilmu Dan Teknologi Peternakan Indonesia (JITPI) Indonesian Journal of Animal Science and Technology) Vol 2 No 1 (2016): Jurnal Ilmu dan Teknologi Peternakan Indonesia (JITPI)
Publisher : Faculty of Animal Husbandry, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (95.458 KB) | DOI: 10.29303/jitpi.v2i1.16

Abstract

The objective of this experiment was to study the effect of dietary supplementation with a source ofbypass protein (cottonseed meal, CSM) on the performance of growing crossbred wethers fed lowdigestibility roughage at high ambient temperature. Sixteen unshorn Border Leicester x Merino lambsaged 6 months and weighing 24.90.37 kg were allocated into a 2x2 factorial design (2 diets and 2ambient temperatures). Each group was fed either wheaten chaff + 2% urea ad libitum or wheaten chaff +1% urea ad libitum + 100g/d cottonseed meal. The results show that respiration rate and rectal temperaturewere significantly affected by ambient temperature (P<0.01), but not by diet. Total dry matter intake wassignificantly higher (P<0.01) at lower temperature than at high temperature, and significantly higher(P=0.04) on the supplemented diet than on the control diet. Water intake tended (P=0.06) to be higher onthe CSM+ diet than on the control diet, and was significantly at greater (P<0.01) high ambient temperaturethan at low temperature. The concentration of NH3-N in the rumen fluid (ranged from 310±17 to 413±20mg N/L) did not differ significantly either between diets or ambient temperatures. Blood plasma ureanitrogen concentration was significantly higher in sheep on the control diet than in those on thesupplemented diet, and at low than high temperature. The organic matter digestibility was not significantlyaffected by temperature and diet. The rate of live weight gain was significantly (P<0.01) reduced by highambient temperature and the interaction between diet and temperature was significant (P<0.01). At lowtemperature, lambs on the supplemented diet grew significantly faster than those on the control diet, butnot at high temperature. In conclusion, high ambient temperature increases respiration rate, rectaltemperature and water intake but reduces dry matter intake and live weight gain. Supplementation with100 g/d of cottonseed meal could not outweigh the depressing effects of constant high ambienttemperature and humidity imposed in this experiment.
THE EFFECT OF MOLASSES SUPPLEMENTATION ON RUMEN FERMENTATION, MICROBIAL PROTEIN SYNTHESIS AND NITROGEN RETENTION IN SHEEP KEPT UNDER HIGH AMBIENT TEMPERATURE AND FED UREA-TREATED BARLEY STRAW MARSETYO, MARSETYO; NOLAN, J.V.; THWAITES, C.J.
Majalah Ilmiah Peternakan Vol 8 No 3 (2005)
Publisher : Fakultas Peternakan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (60.262 KB)

Abstract

SUMMARY This experiment was designed to examine the possibility that soluble carbohydrate was deficient in barley straw given to the sheep. A different level of molasses in the dry matter (DM) of urea-treated barley straw was fed to lambs at 40?b3 0C and at 40-50% relative humidity for a 7 week period. Sixteen Merino sheep were fed a basal diet of urea treated chaffed barley straw with one of 4 level of molasses supplements: (1) 0% (control), (2) 6%, (3) 12%, and (4) 18%. All diets were supplemented with minerals and vitamins. Feed was offered at 09.00 and 16.00 h daily and drinking water was available ad libitum. The parameters recorded were rumen ammonia nitrogen (N) concentration, rumen pH, rumen volatile fatty acid (VFA) concentration, microbial protein synthesis (MPS) and nitrogen content in the feed, faeces and urine. There was no significant effect of molasses on rumen ammonia concentration (P>0.05). The means of ammonia N concentration were 125?b6.1 and 192?b5.8 mg NH3-N/L before and 2 h after feeding. Rumen pH was also not affected by treatment (P>0.05) and averaged 6.7?b0.04. Total VFA concentration and butyric acids as a percentage of total VFA in the rumen fluid increased progressively with increasing the levels of molasses in the diet. The lowest levels, 53.1?b2.1 mmol/L and 6.1?b0.21% were recorded in the controls and the highest levels (70.9?b2.89 mmol/L and 10.9?b0.2%, respectively) in the diet with 12 and18% of molasses. In contrast, as the molasses level increased in the diet, the proportion of acetic acid declined from 75.0?b0.6 to 71.1?b1.1%. The proportion of propionic acid (16.1?b0.29%) was not affected by level of molasses (P>0.05). An increase in MPS from the rumen was recorded as the molasses level increased (P<0.05), from 3.4?b0.35 g N/d in controls to 4.6?b0.07 g N/d at 18% molasses. All sheep had positive N retention, but the level of molasses did not affect N intake, total N excretion (faecal and urinary) as well as N retention (P>0.05; means of 8.6?b0.21, 3.3?b0.09, 3.7?b0.08, 1.6?b0.2 g/d, respectively).
Co-Authors C.J. THWAITES Dahlanuddin Dahlanuddin MARSETYO MARSETYO