Yeast as growth promoter in two breeds of growing rabbits with special reference to its economic implications

ABD EL-AZIZ, AYMAN H.; MAHROSE, KHALID M.; EL-KASRAWY, NAGWA I.; ALSENOSY, ABD EL-WAHAB A.

doi:10.1590/0001-3765202120190274

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MICROBIOLOGY • An. Acad. Bras. Ciênc. 93 (2) • 2021 • https://doi.org/10.1590/0001-3765202120190274 copy

Yeast as growth promoter in two breeds of growing rabbits with special reference to its economic implications

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The present study investigated the effects of dietary supplementation of Saccharomyces cerevisiae (SC) on growth performance, carcass traits, blood biochemical parameters, histological changes in intestinal wall and economic indices in two breeds of weanling rabbits (V-Line and Rex). One-hundred and twenty weaned male rabbits were allotted randomly into four groups in factorial arrangement. The results could be summarized as follows: dietary supplementation of SC significantly accelerated body weight gain (BWG), reduced feed conversion ratio (FCR) and increased profit. The highest BWG and the lowest FCR were noticed in each breed when interacted with SC. There were non-significant differences in carcass traits due to the studied factors, except in loin and dressing percentages. The highest percentages of loin and dressing were obtained from V-line when fed diet supplemented with SC. The treated rabbits with yeast were characterized by an increase in Brunner`s gland and villi. Dietary Supplementation of SC decreased blood total glycerides and cholesterol and increased blood total protein, albumin and A/G ratio. The treated group showed higher profitability than the control. Conclusively, dietary supplementation of SC provided beneficial effects in growth performance and profitability of rabbits. Finally, dietary supplementation of SC is highly recommended in growing rabbits.

Key words
blood components; economic indices; growing rabbits; Saccharomyces cerevisiae

Ingredients	%
Yellow corn	9.5
Soybean meal 44%	15.0
Wheat bran	17.0
Barley	21.7
B. Hay	34.5
Dicalcium phosphate*	1.2
Ground limestone**	0.25
DL-Methionine	0.05
Common salt	0.5
Vitamin + Mineral premix***	0.3
Total	100
Chemical composition of the basal diet
Dry matter	87.8
Moisture	12.2
Crude protein	17.9
Crude fiber	13.75
Ether extract	3.6
Nitrogen-free extract*	42.75
Ash	9.8
DE (Kcal /kg )**	2677.97

Item		Initial body weight (g)	Final body weight (g)	Body weight gain (g)	Total feed consumption (g)	Feed conversion ratio (g feed/ g gain)
Breed effect
V-line		942.6	2048.1	1284.9	3669.3	2.8
Rex		967.1	2088.4	1310.5	3690.8	2.8
SEM		20.6	29.6	23	16	0.05
P value		0.569	0.477	0.456	0.510	0.741
Saccharomyces cerevisiae
Treatment		950.7	2124.5^a	1364.7^a	3771.9^a	2.7
Control		959.5	2005.8^b	1223.5^b	3578.1^b	2.9
SEM		20.6	29.6	23	16	0.05
P value		0.839	0.048	0.009	0.001	0.156
Interactions
V-line	Treatment	940	2116.5	1366.5^a	3756.7^a	2.7^b
V-line	Control	945.5	1972.2	1194.2^b	3572.4^b	2.9^a
Rex	Treatment	961.5	2132.5	1363^a	3787.2^a	2.7^b
Rex	Control	973.4	2039.4	1252.3^ab	3583.3^b	2.8^a
SEM		20.6	29.6	23	16	0.05
P value		0.9411	0.661	0.046	0.001	0.001

Item		Forequarter	Loin	Hindquarter	Giblets	Dressing
Saccharomyces cerevisiae
Treatment		32.6	27	40.2	10.2	54.3^a
Control		33	26.3	40.6	11.4	52.1^b
SEM		0.28	0.38	0.26	0.23	0.57
P value		0.507	0.332	0.510	0.439	0.058
Breed
V-Line		32.2	27.6	40	9.6	54.6^a
Rex		33.4	25.7	40.8	10	51.8^b
SEM		0.28	0.38	0.26	0.23	0.57
P value		0.141	0.567	0.150	0.311	0.009
Breed × treatment interactions
V-Line	Treatment	31.9	28.1^a	39.8	9.9	56.4^a
V-Line	Control	32.5	27.1^ab	40.2	9.8	52.8^b
Rex	Treatment	33.3	25.9^b	40.6	10.5	52.2^b
	Control	33.5	25.5^b	40.9	10.2	51.4^b
SEM		0.28	0.38	0.26	0.23	0.57
P value		0.205	0.040	0.489	0.524	0.002

Item		ALT	AST	Urea	Creatinine	TG	Cholesterol	Albumin	Globulin	TP	AG Ratio
Saccharomyces cerevisiae
Treatment		15.1	21.4	19.3	0.60	57.5^b	38.9^b	4.1^a	3.1	7.2^a	1.3^a
Control		15.6	21.7	21.1	0.65	86.4^a	76.2^a	3.4^b	3.1	6.5^b	1.0^b
SEM		0.31	0.34	1.01	0.01	5.4	4.4	0.09	0.05	0.10	0.03
P value		0.473	0.642	0.414	0.144	0.004	0.000	0.000	0.973	0.000	0.004
Breed
V-Line		15.2	21.6	20.3	0.62	71.3	57.4	3.8	3.2	7.1	1.2
Rex		15.6	21.5	20.1	0.62	72.6	57.7	3.7	3.1	6.8	1.2
SEM		0.31	0.34	1.01	0.01	5.4	4.3	0.09	0.05	0.10	0.04
P value		0.514	0.947	0.907	0.880	0.910	0.967	0.598	0.394	0.328	0.994
Breed × treatment interactions
V-Line	Treatment	14.7	21.5	18.8	0.60	57.0^b	38.1^b	4.1^a	3.1	7.3^a	1.3^a
V-Line	Control	15.6	21.7	21.8	0.64	85.6^a	76.6^a	3.4^b	3.2	6.6^b	1.0^c
Rex	Treatment	15.6	21.3	19.9	0.60	58.0^b	39.6^b	4.0^a	3.1	7.1^a	1.2^ab
	Control	15.6	21.8	20.3	0.64	87.2^a	75.9^a	3.3^b	3.0	6.4^b	1.1^bc
SEM		0.31	0.34	1.01	0.01	5.4	4.3	0.09	0.05	010	0.03
P value		0.715	0.968	0.798	0.128	0.054	0.000	0.000	0.528	0.000	0.029

Item		Feed expenses ($/rabbit)	Total expenses ($/rabbit)	Total return ($/rabbit)	Net return ($/rabbit)	Feed cost/ kg gain ($)	B/C ratio (%)
Saccharomyces cerevisiae
Treatment		090^a	3.3	4.9^a	1.6^a	0.65	148.4^a
Control		0.85^b	3.3	4.6^b	1.3^b	0.69	139.4^b
SEM		0.01	0.01	0.08	0.08	0.01	2.5
P value		0.000	0.972	0.044	0. 028	0.156	0.011
Breed
V-Line		0.88	3.3	4.7	1.4	0.68	142.4
Rex		0.88	3.3	4.8	1.5	0.68	145.5
SEM		0.01	0.01	0.08	0.08	0.01	2.5
P value		0.339	0.291	0.504	0.574	0.749	0.525
Breed × treatment interactions
V-Line	Treatment	0.90^a	3.3	4.8^a	1.5^a	0.65	145.4^a
V-Line	Control	0.85^b	3.3	4.5^b	1.2^b	0.71	136.3^b
Rex	Treatment	0.90^a	3.3	4.9^a	1.6^a	0.66	148.5^a
	Control	0.85^b	3.3	4.6^b	1.3^b	0.67	139.3^b
SEM		0.01	0.01	0.08	0.08	0.01	2.5
P value		0.000	0.178	0.020	0.057	0.402	0.038

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[1] Correspondence to: Khalid M. Mahrose E-mail: ostrichkhalid@zu.edu.eg