Characteristics of the carcass of goats of different genotypes fed pineapple (<i>Ananas comosus</i> L.) stubble hay

Lima, Rosângela Maria Brito; Sousa, Wandrick Hauss de; Medeiros, Ariosvaldo Nunes de; Cezar, Marcílio Fontes; Cartaxo, Felipe Queiroga; Gonzaga Neto, Severino; Costa, Roberto Germano; Medeiros, Geovergue Rodrigues de

doi:10.1590/s1806-92902015000200002

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Ruminants • R. Bras. Zootec. 44 (2) • Feb 2015 • https://doi.org/10.1590/s1806-92902015000200002 copy

Characteristics of the carcass of goats of different genotypes fed pineapple (Ananas comosus L.) stubble hay

Authorship SCIMAGO INSTITUTIONS RANKINGS

The effect of the substitution of Tifton hay (0, 33, 66, 100 g/100 g) for pineapple (Ananas comosus L.) stubble hay was evaluated in the characteristics of the carcasses of goats of an unknown breed (UB) in feedlot. Thirty-two bucks with an average initial live weight of 17.5±1.3 kg, at approximately 150 days of age, were housed in individual stalls provided with feeding and drinking troughs. The animals were distributed in a completely randomized design with four treatments and eight replications. There was a quadratic effect on the weights of hot carcass and cold carcass, empty body, and loin eye area. A linear increase was observed for losses by carcass cooling. The weights of commercial cuts and the weights of total muscle, total bone, intramuscular fat, and total fat decreased linearly. All morphometric measurements were influenced by the inclusion of pineapple stubble hay in the .diets. Substitution of Tifton hay for pineapple stubble hay at the level of 33 g/100 g improves the carcasses of UB goats qualitatively and quantitatively

compactness index; loin eye area; morphometric measurements; subcutaneous fat thickness; waste cultures

Ingredients (g/kg DM)	Levels of pineapple stubble hay (g/100 g)
Ingredients (g/kg DM)	0	33			66	100
Pineapple stubble hay	0.00	165.0			335.0	500.0
Tifton hay	500.0	335.0			165.0	0.00
Ground corn	380.0	372.0			300.0	180.0
Soybean meal	71.0	98.0			85.0	70.0
Wheat bran	0.00	0.00			80.0	213.0
Vegetable oil	20.0	1.00			0.00	0.00
Urea	15.0	15.0			15.0	17.0
Limestone	10.0	10.0			15.0	15.0
Mineral salt	4.00	4.00			5.00	5.00
Chemical composition (g/kg DM)
Dry matter	870.3		865.0	863.1		861.6
Ash	55.8		53.9	58.7		59.8
Crude protein	150.0		158.0	156.0		162.0
Ether extract	39.6		27.3	32.4		38.3
Neutral detergent fiber	346.8		357.9	389.8		438.0
Acid detergent fiber	254.1		238.8	228.7		224.8
Total carbohydrates	754.6		760.8	752.9		744.4
Total digestible nutrients	708.9		702.1	702.5		696.5

Variables	Level of pineapple stubble hay (g/100 g)				X±SD	Regression		R²
Variables	0	33	66	100	X±SD	L	Q	R²
Initial weight (kg)	18.10	18.70	17.60	15.90	17.73±1.91	-	-	-
Slaughter weight (kg)	25.36	25.90	22.42	20.17	23.46±2.68	1	ns	81.31
Hot carcass weight (kg)	12.74	14.12	11.12	9.80	11.94±2.29	ns	2	82.26
Cold carcass weight (kg)	12.52	13.83	10.82	9.54	11.68±2.27	ns	3	82.32
Empty body weight (kg)	21.17	22.85	18.82	17.01	19.96±3.16	ns	4	83.51
Hot carcass yield (g/100 g)	49.80	52.52	50.17	49.66	50.54±3.66	ns	ns	-
Cold carcass yield (g/100 g)	48.97	51.45	48.80	48.38	49.40±3.58	ns	ns	-
Biological yield (g/100 g)	60.12	61.68	59.32	57.28	59.60±3.65	ns	ns	-
Loss by cooling (g/100 g)	1.68	2.03	2.71	2.58	2.25±0.75	5	ns	82.23

Variables	Level of pineapple stubble hay (g/100 g)				X±SD	Regression		R²
Variables	0	33	66	100	X±SD	L	Q	R²
Conformation	2.06	1.99	1.61	1.42	1.77±0.46	2	ns	94.28
Exterior visual impressions	1.65	1.40	1.13	1.07	1.31±0.29	3	ns	94.20
Kidney-pelvic fat	2.29	2.54	2.27	2.20	2.32±0.45	ns	ns	-
Marbling (1 to 3)¹	1.25	1.21	1.21	1.19	1.21±0.25	ns	ns	-

Variables	Level of pineapple stubble hay (g/100 g)				X±SD	Regression		R²
Variables	0	33	66	100	X±SD	L	Q	R²
Chest width (cm)	10.80	11.00	10.60	10.10	10.62±0.80	1	ns	70.33
Rump width (cm)	13.50	13.40	12.50	11.90	12.82±1.50	2	ns	93.09
Chest depth (cm)	24.60	25.10	24.20	23.50	24.35±1.25	3	ns	64.78
Chest circumference (cm)	62.10	63.20	60.60	59.10	61.25±2.80	4	ns	70.60
Rump circumference (cm)	44.60	44.70	43.10	40.40	44.13±3.10	5	ns	84.07
Leg circumference (cm)	31.30	31.50	30.10	28.90	30.45±2.44	6	ns	85.31
Carcass length (cm)	55.40	56.40	54.40	51.80	54.50±2.82	ns	7	97.29
Inner carcass length (cm)	61.40	61.10	59.60	57.50	59.90±3.00	8	ns	91.66
Leg length (cm)	39.47	40.20	39.10	37.60	39.09±1.61	ns	9	96.87

Variables	Level of pineapple stubble hay (g/100 g)				X±SD	Regression		R²
Variables	0	33	66	100	X±SD	L	Q	R²
LEA (cm²)	8.11	9.73	8.43	7.96	8.56±1.52	ns	1	62.69
SFT (mm)	1.74	1.37	1.26	1.32	1.42±0.45	2	ns	67.69
CCI (g/cm)	0.20	0.22	0.18	0.17	0.19±0.03	3	ns	60.31
LCI (cm)	0.34	0.33	0.32	0.31	0.32±0.03	ns	ns	-
LMI (g/cm)	0.01	0.01	0.01	0.01	0.01±0.0008	ns	ns	-

Variables	Level of pineapple stubble hay (g/100 g)				X±SD	Regression		R²
Variables	0	33	66	100	X±SD	L	Q	R²
Leg (kg)	1.73	1.79	1.56	1.37	1.62±0.27	1	ns	80.75
Loin (kg)	0.76	0.81	0.67	0.58	0.71±0.13	2	ns	76.89
Ribs (kg)	1.55	1.76	1.41	1.27	1.50±0.32	3	ns	54.57
Shoulder (kg)	1.22	1.28	1.08	1.00	1.15±0.19	4	ns	75.65
Neck (kg)	0.80	0.91	0.77	0.72	0.80±0.13	5	ns	42.07
Leg (g/100 g)	27.95	26.82	28.15	27.69	27.65±1.44	ns	ns	-
Loin (g/100 g)	12.33	12.14	12.09	11.82	12.10±0.76	ns	ns	-
Ribs (g/100 g)	24.93	26.07	25.43	25.36	25.45±1.71	ns	ns	-
Shoulder (g/100 g)	19.68	19.06	19.61	20.14	19.62±1.01	ns	ns	-
Neck (g/100 g)	13.08	13.60	13.99	14.55	13.81±1.43	6	ns	99.58

Variables	Level of pineapple stubble hay (g/100 g)				X±SD	Regression		R²
Variables	0	33	66	100	X±SD	L	Q	R²
Total muscle (kg)	1.14	1.18	1.00	0.89	1.06±0.20	1	ns	79.38
Total bone (kg)	0.42	0.42	0.37	0.34	0.39±0.05	2	ns	84.53
Subcutaneous fat (kg)	0.02	0.03	0.02	0.02	0.02±0.007	ns	ns	-
Intramuscular fat (kg)	0.03	0.03	0.02	0.02	0.02±0.01	3	ns	92.23
Total fat (kg)	0.05	0.06	0.05	0.04	0.05±0.01	4	ns	86.91
Other tissues (kg)	0.09	0.08	0.10	0.06	0.08±0.05	ns	ns	-
Muscle (g/100 g)	65.53	66.94	64.92	65.40	65.70±4.22	ns	ns	-
Bone (g/100 g)	24.26	24.19	24.34	25.75	24.64±1.93	ns	ns	-
Fat (g/100 g)	3.48	3.47	3.17	3.39	3.38±0.74	ns	ns	-
Other tissues (g/100 g)	5.06	4.56	6.74	4.37	5.18±3.10	ns	ns	-
Muscle:bone ratio	2.71	2.78	2.68	2.56	2.68±0.32	ns	ns	-
Muscle:fat ratio	19.68	20.50	20.97	19.63	20.20±3.89	ns	ns	-

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E-mail: rbz@sbz.org.br

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[t02TFN01] X±SD - mean and standard deviation; L - linear; Q - quadratic; R²- coefficient of determination; ns - not significant.

[t02TFN02] ¹ Ŷ = 26.344985 − 0.055627; P<0.01.

[t02TFN03] ² Ŷ = 12.741500 + 0.168798x − 0.004764x2; P<0.05.

[t02TFN04] ³ Ŷ = 12.528300 + 0.165462x − 0.004731x2; P<0.05.

[t02TFN05] ⁴ Ŷ = 21.170625 + 0.217696x − 0.006254x2; P<0.05.

[t02TFN06] ⁵ Ŷ = 1.686587 − 0.005428x; P<0.05.