Correction ultrasonographic measurement of carcass in rabbits using mixed linear Model with covariates

Santos, N.P.S.; Guerra, L.O.; Biagiotti, D.; Santos, G.V.; Sousa, D.C.; Santos, D.C.E.; Sousa, C.A.; Sarmento, J.L.R.

doi:10.1590/1678-4162-10416

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Medicina Veterinária • Arq. Bras. Med. Vet. Zootec. 71 (02) • Mar-Apr 2019 • https://doi.org/10.1590/1678-4162-10416 copy

Correction ultrasonographic measurement of carcass in rabbits using mixed linear Model with covariates

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this study was to evaluate the correction ultrasonographic measurement of area the Longissimus dorsi muscle in New Zealand rabbits by covariance analysis using mixed linear models. The analyzes were performed in randomized block design with 5 treatments (operators) and 6 blocks (animals), considering in the analysis: absence of covariates; rib eye length as covariate; rib eye depth as covariate; the two covariates together. As the animals are a random sample, the block effect was considered to be random. The covariates were considered as measures of fixed effect without error, independent of treatment and linear comportment. The decision criterion statistics CV%, R², and $\bar{R} ²$ showed a direct relationship between them and can be taken into consideration to evaluate the experimental accuracy in tests with carcass evaluation. The AIC, BIC, and AICC statistics are consistent with the interpretation of the decision criteria and indicate that the two covariates in model provides accurate results. The inclusion of covariates complements the local control to improve the accuracy of the experiment. The use of ultrasound measurements of depth and length corrects the mean area of the Longissimus dorsi muscle evaluated by different operators.

Keywords:
loin eye area; rabbit breeding; animal experimentation; Longissimus dorsi; experimental precision

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] E-mail: natanael@ufpi.edu.br

Delineamento / Modelo	FV	GL	QM	F	CV%	R²	${\bar{R}}^{2}$	AIC	BIC	AICC	EB
DBC $Y_{i j} = m + t_{i} + b_{j} + e_{i j}$	operador	4	534,58	2,09^ns	8,5	0,67	0,65	231,8	231,4	232,4	1,94
	animal	5	1646,86	6,44*
	erro	20	255,9	-
DBC_C $Y_{i j} = m + t_{i} + β_{C} (C_{i j} - {\bar{C}}_{1}) + b_{j} + e_{i j}$	operador	4	208,87	1,04^ns	7,5	0,73	0,71	221,5	221,1	222,1	2,24
	animal	5	1646,86	8,19*
	comprimento	1	1298,35	6,45*
	erro	19	201,03	-
DBC_P $Y_{i j} = m + t_{i} + β_{P} (P_{i j} - {\bar{P}}_{2}) + b_{j} + e_{i j}$	operador	4	433,78	2,72^ns	6,6	0,80	0,78	206,9	206,5	207,5	2,61
	animal	5	1646,86	10,34*
	profundidade	1	2090,95	13,12*
	erro	19	159,32	-
DBC_CP $Y_{i j} = m + t_{i} + β_{C} (C_{i j} - {\bar{C}}_{1}) + β_{P} (P_{i j} - {\bar{P}}_{2}) + b_{j} + e_{i j}$	operador	4	263,45	3,46*	4,6	0,91	0,90	190,6	190,2	191,2	6,82
	animal	5	1646,86	21,64*
	comprimento	1	1657,05	21,77*
	profundidade	1	2449,65	32,18*
	erro	18	76,11	-

Coelho	DBC	DBC_C	DBC_P	DBC_CP	Abate
1	195,51	199,26	192,28	196,25	196,20
2	158,06	161,56	175,09	180,55	181,62
3	182,50	188,01	191,93	199,01	198,01
4	190,32	193,82	186,41	190,04	192,27
5	212,58	209,78	194,32	189,54	190,25
6	195,87	182,43	194,85	189,45	190,93
Amplitude	54,52	48,22	19,76	18,46	16,39

Delineamento	DBC_C	DBC_P	DBC_CP	Abate
DBC	0,92*	0,87*	0,44^ns	0,50^ns
DBC_C	-	0,76^ns	0,58^ns	0,62^ns
DBC_P	-	-	0,71^ns	0,74^ns
DBC_CP	-	-	-	0,99*