Replacement of corn with pre-dried cassava root silage in the diet for dairy goats

Silva, Maria Josilaine Matos dos Santos; Silva, Edneide Rodrigues da; Santos, Fátima Lira dos; Santos, Cinthya Mikaelly da Silva; Cavalcante, Paulo Otávio Silva; Pereira, Kedes Paulo; Almeida, Vitor Visintin Silva de; Lima Júnior, Dorgival Morais de

doi:10.4025/actascianimsci.v44i1.55947

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RUMINANT NUTRITION • Acta Sci., Anim. Sci. 44 • 2022 • https://doi.org/10.4025/actascianimsci.v44i1.55947 copy

Replacement of corn with pre-dried cassava root silage in the diet for dairy goats

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT.

The objective of this study was to evaluate the effect of replacement of corn with pre-dried cassava root silage (CRS) on intake, ingestive behavior, production and composition of goat milk. Five lactating Saanen goats were used, with 42.5 ± 4.2 kg body weight and production of 2 kg milk day^-1, distributed in a 5 x 5 Latin square with five treatments: 0, 28.6, 58.0, 81.6 and 100% replacement of corn with CRS in the diet dry matter. Goats were monitored for five periods of 15 days each. The intake of dry matter, crude protein and neutral detergent fiber decreased linearly (p <0.05) with the replacement of corn with CRS. Feeding (348.5 ± 62.1 min.) and rumination (468.8 ± 83.8 min.) times were not influenced (p >0.05) by the replacement of corn with CRS, but the ingestion and rumination efficiencies had a linear increase (p > 0.05). Milk production (2.17 ± 0.45 kg day^-1), fat (3.49 ± 0.42%), protein (3.11 ± 0.13%) and lactose (4.47 ± 0,11%) of goat milk were not influenced (p >0.05) by the replacement of corn with CRS. Therefore, it is recommended the total replacement of corn with pre-dried cassava root silage in the diet for dairy goats with an average production of 2 kg day^-1.

Keywords:
goat milk; ingestive behavior; Manihot esculenta; root silage

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[1] * Author for correspondence. E-mail: juniorzootec@yahoo.com.br

	Ingredientes
	Tifton 85 hay	Corn grain	Soybean meal	Cassava root silage
Dry matter¹	859.2	831.0	841.9	402.9
Organic matter²	946.2	981.1	935.4	900.2
Mineral matter²	53.8	18.9	64.9	39.8
Crude protein²	116.5	65.5	490.4	60.2
Neutral detergent fiber²	798.9	117.5	154.6	65.8
Acid detergent fiber²	395.4	35.4	88.5	30.8

	Levels of pre-dried cassava root silage (%)
	0	28.6	58.0	81.6	100
Proportion of Ingredients (% DM)
Tifton 85 Hay	57.28	55.35	53.10	52.40	52.07
Cassava root silage	0.00	8.00	16.22	22.80	29.10
Grain corn	27.95	20.94	13.93	7.01	0.00
Soybean meal	13.26	14.21	15.25	16.29	17.33
Mineral salt	1.00	1.00	1.00	1.00	1.00
Limestone	0.50	0.50	0.50	0.50	0.50
Composição química
Dry matter¹	889.3	785.3	70.40	63.72	58.19
Organic matter²	940.3	934.1	927.7	922.2	917.1
Mineral matter²	59.6	61.0	62.4	64.0	65.7
Crude protein²	150.0	152.7	155.5	159.2	163.2
Neutral detergent fiber²	493.8	477.6	459.3	451.9	447.2
Acid detergent fiber²	248.1	244.1	239.1	239.1	240.5

	Levels of replacement with cassava root silage					SEM	Pr > F		R²
	0	28.6	58.0	81.6	100	SEM	L	Q	R²
Feeding time (min. day^-1)	368	366	338	332	0.84	62.08	>0.05	>0.05	-
Rumination time (min. day^-1)	454	434	500	464	0.36	83.79	>0.05	>0.05	-
Idle time (min. day^-1)	618	640	602	646	0.00	110.16	>0.05	>0.05	-
Intake efficiency (g DM min^-1)	198.2	213.4	220.4	244.4	0.80	74.54	0.004	>0.05	0.80
Rumination efficiency (g DM min.^-1)	247.8	251.4	329.8	335.8	0.86	96.36	0.000	>0.05	0.86
Number of cuds (cuds day^-1)	31453	31318	30890	28091	29251	9936.94	>0.05	>0.05	-
Chewing time (sec cud^-1)	42.78	43.58	38.43	37.89	47.93	15.09	>0.05	>0.05	-
Number of chews (n cud^-1)	49.18	51.84	45.01	42.07	49.48	12.96	>0.05	>0.05	-
Rumination cycle time (min. cycle ^-1)	8.24	9.84	7.46	6.40	11.40	4.75	>0.05	>0.05	-
Ruminated dry matter (g cud^-1)	2.99	2.83	2.56	2.48	2.46	1.06	>0.05	>0.05	-

	Levels of replacement with cassava root silage					SEM	Pr > F		R²
	0	28.6	58.0	81.6	100	SEM	L	Q	R²
Milk production (kg day^-1)	2.25	2.17	2.13	2.25	2.08	0.45	>0.05	>0.05	-
Corrected milk production (kg day^-1)	2.28	2.17	2.24	2.28	2.01	0.44	>0.05	>0.05	-
pH	6.32	6.47	6.41	6.29	6.40	0.43	>0.05	>0.05	-
Density (g L^-1)	1.04	1.04	1.04	1.04	1.04	0.03	>0.05	>0.05	-
Fat (%)	3.56	3.47	3.49	3.59	3.36	0.42	>0.05	>0.05	-
Protein (%)	3.12	3.10	3.14	3.12	3.07	0.13	>0.05	>0.05	-
Lactose (%)	4.45	4.52	4.47	4.48	4.45	0.10	>0.05	>0.05	-
Total solids (%)	12.05	12.00	12.29	12.07	11.79	0.53	>0.05	>0.05	-
Defatted extract (%)	8.48	8.52	8.50	8.48	8.43	0.18	>0.05	>0.05	-