The quality of crude glycerine influences the fermentation and nutritive value of Piatã grass silage

Schwingel, Alice Watte; Fernandes, Tatiane; Orrico Junior, Marco Antonio Previdelli; Orrico, Ana Carolina Amorim; Lucas Junior, Jorge de; Reis, Ricardo Andrade; Souza, Ronaldo Omizolo de

doi:10.37496/rbz4920200114

Acessibilidade / Reportar erro

Brasil

Revista Brasileira de Zootecnia

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Forage Crops • R. Bras. Zootec. 49 • 2020 • https://doi.org/10.37496/rbz4920200114 copy

The quality of crude glycerine influences the fermentation and nutritive value of Piatã grass silage

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

We aimed to evaluate the effects of crude glycerine purity and levels of glycerol on the fermentative profile, microorganisms counting, and nutritional value of Piatã grass silage. The experiment was carried out in a 3×3+1 completely randomized factorial design using three different types of crude glycerine [low purity (40% of glycerol), medium purity (60% glycerol), and high purity (80% glycerol)], three doses of glycerol (20, 40, and 60 g/kg DM), and a control (no crude glycerine added) as an additional treatment, which were stored for 80 days. Statistical differences were not observed on fermentative losses of the treatments tested. The increase of glycerol doses resulted in higher levels of non-fibrous carbohydrates and lower levels of fibre components. The addition of low-purity crude glycerine increased the levels of fat and in vitro digestibility of silages. The highest levels of lactic acid and acetic acid occurred in the treatments with 60 g/kg of glycerol when using crude glycerine with a low purity. The lowest lactic acid content was observed in the control treatment and in the lowest dose of glycerol. The highest glycerol dose (60 g/kg), associated with the lowest degree of crude glycerine purity (40%) resulted in the greatest nutritional value and provided the best silage conservation.

Keywords:
byproduct of biodiesel; fermentation profile; forage conservation; ruminant feed

Parameter	Crude glycerine purity
Parameter	Low (40% of glycerol)	Medium (60% of glycerol)	High (80% glycerol)
	Composition of mixture of crude glycerine and pure glycerol
Crude glycerine (mL/L)	698.25	464.99	232.19
Glycerol (mL/L)	301.75	535.01	767.81
	Crude glycerine composition
Glycerol (g/kg)	400.0	600.0	800.0
Total solids (g/kg)	972.1	981.4	990.7
Methanol (g/kg)	42.6	28.4	14.2
Lipids (g/kg)	521.6	347.4	173.5
	Crude glycerine volume (mL/kg of DM)
Control	0.0	0.0	0.0
20 g glycerol/kg of DM	50.0	33.3	25.0
40 g glycerol/kg of DM	100.0	66.7	50.0
60 g glycerol/kg of DM	150.0	100.0	75.0

	Control	Types of crude glycerine (CG)			Glycerol (GL) doses (g/kg)			SEM	P-value
	Control	Low	Medium	High	20	40	60	SEM	CG	GL	CG*GL
Initial DM ¹ 1 g/kg of forage.	338.49cB	346.44bc	355.70ab	358.39a	363.82A	355.39A	341.33B	8.463	0.02	<0.01	0.02
Final DM ¹ 1 g/kg of forage.	283.71c	297.43bc	310.09ab	315.45a	312.55	308.61	301.71	12.26	0.02	0.19	0.25
Crude protein	38.75bB	39.74b	45.68a	46.82a	48.42A	44.08AB	39.75B	3.35	<0.01	<0.01	0.19
Ether extract	17.52bC	67.65a	57.62a	28.05b	31.70BC	45.33B	76.29A	12.815	<0.01	<0.01	<0.01
Neutral detergent fibre	709.11aA	515.80b	566.47b	561.97b	613.81B	549.96C	480.48D	40.613	0.03	<0.01	0.03
Acid detergent fibre	411.50A	294.16	314.82	303.09	344.91B	304.85B	262.31C	29.61	0.35	<0.01	0.05
Hemicellulose	297.61aA	225.60c	251.66b	258.88b	268.90A	245.11B	222.14C	14.71	<0.01	<0.01	0.19
Non-fibre carbohydrate	154.87bC	295.79a	245.33a	279.56a	221.88BC	276.47AB	322.34A	39.65	0.04	<0.01	0.17
Total carbohydrates	863.98aA	811.59b	811.80b	841.53a	835.68AB	826.43B	828.10C	15.924	<0.01	<0.01	0.01
NDF digestibility	691C	835	829	836	798B	828B	874A	34.3	0.92	<0.01	0.43
DM loss	160.16	176.01	140.3	134.08	134.42	167.65	148.32	48.66	0.17	0.37	0.71
Effluent loss	6.32	4.88	3.75	4.24	3.71	4.22	4.97	1.89	0.46	0.38	0.93
Gas loss	58.37	42.96	42.82	42.29	45.15	41.65	41.27	12.78	0.99	0.78	0.99

	Control	Types of crude glycerine (CG)			Glycerol (GL) doses (g/kg)			SEM	P-value
	Control	Low	Medium	High	20	40	60	SEM	CG	GL	CG*GL
pH (initial)	5.97cC	6.31a	6.22ab	6.08bc	6.10BC	6.21AB	6.29A	0.113	0.01	0.01	0.25
pH (final)	4.78a	4.24b	4.43b	4.36b	4.41	4.31	4.30	0.145	0.03	0.22	0.92
Lactic acid	9.47cC	22.17a	16.92b	14.24bc	12.91BC	17.00A	13.42B	3.725	<0.01	<0.01	<0.01
Acetic acid	16.43aA	15.17a	7.58c	10.86b	9.03B	10.54B	14.02A	2.057	<0.01	<0.01	<0.01
Butyric acid	15.33aA	6.90c	11.64b	11.08b	11.21B	9.17C	9.24BC	1.548	0.01	0.02	0.01
Propionic acid	3.63A	1.51	1.07	1.39	2.39B	0.91C	0.92C	0.642	0.34	<0.01	0.01
Lactic acid bacteria	7.22bC	7.45a	7.44ab	7.60a	7.40BC	7.52AB	7.58A	0.133	0.01	<0.01	0.97
Mesophilic bacteria	6.92cD	7.35b	7.48b	7.67a	7.22C	7.50B	7.77A	0.111	<0.01	<0.01	0.01
Yeast	0.83cC	2.07bc	3.67a	2.16b	3.94A	2.68B	1.27C	0.693	<0.01	<0.01	<0.01
Mould	0.76abAB	0.92ab	1.26a	0.26b	1.51A	0.92AB	0.00B	0.798	0.04	<0.01	0.07

Sociedade Brasileira de Zootecnia Universidade Federal de Viçosa / Departamento de Zootecnia, 36570-900 Viçosa MG Brazil, Tel.: +55 31 3612-4602, +55 31 3612-4612 - Viçosa - MG - Brazil
E-mail: rbz@sbz.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Corresponding author: marcoorrico@yahoo.com.br