Pre-slaughter fasting times for broiler chickens

Schneider, A.F.; Gewehr, C.E.

doi:10.1590/1678-4162-13018

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Veterinary Medicine and Technology and Inspection of Animal Products • Arq. Bras. Med. Vet. Zootec. 75 (6) • Nov-Dec 2023 • https://doi.org/10.1590/1678-4162-13018 copy

Pre-slaughter fasting times for broiler chickens

[Tempos de jejum pré-abate em frango de corte]

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This study aimed to evaluate the effect of different pre-slaughter fasting times on live weight and meat quality of broiler chickens slaughtered at 35 and 42 days of age. Treatments consisted of four, eight, 12, and 16 hours of total fasting before slaughter. Eight birds of each sex were slaughtered at each time of fasting. Regression analysis indicated that the longer the fasting time, the greater the weight reduction in both males and females (35/42 days). However, analysis of variance highlighted no weight reduction (P>0.05) for four, eight, and 12 hours of fasting in males slaughtered at 35 and 42 days of age and in females at 35 days. However, females slaughtered at 42 days of age showed no differences (P>0.05) for four and eight hours of fasting. After 16 hours of fasting, both males and females slaughtered at 35 and 42 days of age showed higher weight reductions (P<0.05) than after the other fasting times. No live weight reductions (P>0.05) were observed for male and female birds of 35 and 42 days of age, respectively. Regarding meat quality, no changes (P>0.05) were found for CL and WHC in males and females at 35 and 42 days of age, respectively.

Keywords:
Animal welfare; shear; cooking loss; meat quality; food restriction

Sex	Fasting time	Weight reduction 35 days*	Weight reduction 42 days*	Probability 35x42 days	SEM 35x42 days
Male	4	2.00 b	1.81 b	0.2128	0.87
	8	2.82 b	1.98 b	0.2497	1.81
	12	3.35 ab	2.69 b	0.4244	0.84
	16	4.92 a	4.68 a	0.8020	1.52
	Probability	0.0037	0.0012
	SEM	1.20	1.14
	Regression	y=0.224x+0.996	y=0.247x+0.328
Female	4	2.29 b	1.60 c	0.6353	1.04
	8	3.57 ab	2.57 c	0.6126	1.58
	12	3.63 ab	3.04 b	0.8092	1.82
	16	4.78 a	4.46 a	0.1003	1.14
	Probability	0.0270	0.0001
	SEM	1.53	0.89
	Regression	y=0.189x+1.679	y=0.226x+0.660
	Weight reduction at 35 days between male and females
	4 h	8 h	12 h	16 h
Male	3.36	3.48	3.11	4.92
Female	2.67	3.38	3.37	3.86
Probability	0.1169	0.8803	0.6253	0.1645
SEM	0.69	1.12	0.79	1.19
	Weight reduction at 42 days between male and females
	4 h	8 h	12 h	16 h*
Male	2.69	3.51	3.98	5.16 a
Female	2.79	2.67	2.46	2.75 b
Probability	0.8241	0.1541	0.0649	0.0016
SEM	0.82	1.03	0.77	0.95

Sex	Fasting time	CL 35 days	CL 42 days	Probability 35x42 days	SEM 35x42 days
Male	4	24.9	25.1	0.9517	4.21
	8	26.8	25.4	0.9801	3.40
	12	27.6	24.5	0.9620	2.42
	16	29.7	25.3	0.4162	3.72
	Probability	0.3464	0.9914
	SEM	3.56	4.44
Female	4	27.4	24.8	0.2515	3.10
	8	25.2	21.9	0.1083	3.60
	12	23.8	22.3	0.3416	2.76
	16	23.4	24.8	0.1186	1.17
	Probability	0.1543	0.1000
	SEM	3.07	2.65
		CL at 35 days between male and females
	4 h	8 h	12 h	16 h
Male	24.9	25.4	24.6	25.7
Female	27.4	25.3	23.8	23.7
Probability	0.1784	0.9398	0.7021	0.0801
SEM	3.18	3.80	2.90	0.70
	CL at 42 days between male and females
	4 h	8 h	12 h	16 h
Male	25.1	25.9	24.5	26.9
Female	25.5	21.9	22.3	24.8
Probability	0.8645	0.071	0.2259	0.3118
SEM	3.970	3.20	2.49	3.10

Sex	Fasting time	WHC 35 days	WHC 42 days	Probability 35 x 42 days	SEM 35x42 days
Male	4	23.4	28.3	0.3002	3.08
	8	25.8	26.7	0.5186	2.45
	12	22.3	23.7	0.7362	3.48
	16	24.4	22.9	0.4714	3.51
	Probability	0.2488	0.1139
	SEM	3.18	3.95
Female	4	24.3	27.1	0.4471	2.94
	8	25.3	27.2	0.3925	3.45
	12	21.7	25.4	0.0510	2.93
	16	24.3	27.2	0.0696	3.63
	Probability	0.1170	0.5289
	SEM	3.09	3.78
		WHC at 35 days between male and females
	4 h	8 h	12 h	16 h
Male	23.4	25.8	22.3	24.4
Female	24.8	25.3	21.7	23.8
Probability	0.3185	0.7602	0.7459	0.6883
SEM	2.68	3.08	3.86	2.80
	WHC at 42 days between male and females
	4 h	8 h	12 h	16 h
Male	26.4	26.7	23.7	22.9
Female	27.0	26.8	25.09	26.5
Probability	0.7736	0.9075	0.3391	0.0904
SEM	3.79	2.94	2.31	3.61

Universidade Federal de Minas Gerais, Escola de Veterinária Caixa Postal 567, 30123-970 Belo Horizonte MG - Brazil, Tel.: (55 31) 3409-2041, Tel.: (55 31) 3409-2042 - Belo Horizonte - MG - Brazil
E-mail: abmvz.artigo@gmail.com

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[1] *Corresponding author:clovis.gewehr@udesc.br