1679
Crude Glycerin in multiple supplements for beef cattle in grazing: pH and ammoniacal nitrogen

Tuesday, July 22, 2014
Exhibit Hall AB (Kansas City Convention Center)
Rones Goulart de Paula Junior , FEDERAL UNIVERSITY OF MATO GROSSO, CUIABA, Brazil
Adriano J Possamai , UFMT, Cuiabá, Brazil
Joanis T. Zervoudakis , FEDERAL UNIVERSITY OF MATO GROSSO, CUIABA, Brazil
Luciano da Silva Cabral , FEDERAL UNIVERSITY OF MATO GROSSO, CUIABA, Brazil
Luciana Keiko Hatamoto-Zervoudakis , FEDERAL UNIVERSITY OF MATO GROSSO, CUIABA, Brazil
Allan C Barboza , UFMT, Cuiabá, Brazil
Lucien Bissi da Freiria , FEDERAL UNIVERSITY OF MATO GROSSO, CUIABA, Brazil
Jaqueline B Azevedo , Federal University of Mato Grosso, Cuiabá, Brazil
André S Oliveira , UFMT, Sinop, Brazil
Abstract Text:

Crude Glycerin in multiple supplements for beef cattle in grazing: pH and ammoniacal nitrogen

Objective was evaluate the pH and concentration of ruminal ammoniacal nitrogen (NH3-N) in beef cattle receiving multiple supplementation in grazing, with increasing levels of crude glycerin, in the rainy season. It has been utilized five Nellore beef cattle, male, non-castrated. The pastures were divided into five picket of 0.25 ha each, covered with Brachiaria brizantha cv. Marandu. The experiment was divided into 5 x 5 Latin square design, composed by five experimental periods of 19 days each and five animals. The strategy adopted was to provide 4 kg/animal/day of multiple supplements with four levels of crude glycerin (0; 8; 16 and 24%) and the mineral mixture (MM) was offered ad libitum(control). Ruminal liquid samples were collected for measuring the pH and quantification of NH3-N by gavage, in two times (0 and 4 hours after supplementation). The pH values for the time 0 and 4 hours did not differ between the supplements (P> 0.05) (Table 1), with average value of 6.83 and 6.59, respectively. It was verified decrease in measuring 4 hours after the supplementation in comparison to time 0 (P<0.01), demonstrating that there is a normal diurnal variation in the pH value without it being influenced by the multiple supplementation, important fact in the maintenance of ruminal fermentation. The content of NH3-N has not been influenced by the supplementation prior to the concentration being supplied (P>0.05) with average between the treatments of 4.98 mg/dL. It was observed at time four the raise in the content of NH3-N for multiple supplementation regardless the formulation utilized (P<0.01), while the control has not promoted such effect (P>0.05). The average values of NH3-N from animals receiving multiple supplementation was of 11.08 mg/dL, adequate for microbial development and ruminal fermentation.

Table 1. Mean values of pH and concentration of NH3-N (mg/dL) in ruminal fluid

Times

Supplements

 

MM

0% GLYC1

8% GLYC1

16% GLYC1

24% GLYC1

SEM2

Ruminal pH

 

T 0

6.85Aa

6.88Aa

6.86Aa

6.80Aa

6.80Aa

0.10

T 4

6.68Ab

6.61Ab

6.65Ab

6.51Ab

6.53Ab

0.14

 

NH3-N

 

T 0

3.72Aa

6.08Ab

5.68Ab

5.03Ab

4.40Ab

1.57

T 4

5.46Ba

15.64Aa

11.57Aa

12.25Aa

10.50Aa

3.73

Means followed by the same small letter in the column and same uppercase letter in row do not differ at 5% probability by SNK test. 1levels of crude glycerin; 2 standard errors of the mean.

Keywords: Nelore, rainy season, supplementation