Genetic analysis of growth traits in Iranian Makuie sheep breed

Figures & data

Table 1 The six models and their fixed and random effects.

	Fixed effects				Random effects
Model	YR	SX	BT	AD	AN	M	PE	E	rAM
I	*	*	*	*	*	–	–	*	–
II	*	*	*	*	*	–	*	*	–
III	*	*	*	*	*	*	–	*	–
IV	*	*	*	*	*	*	–	*	≠0
V	*	*	*	*	*	*	*	*	=0
VI	*	*	*	*	*	*	*	*	≠0

YR, year; SX, sex; BT, birth type; AD, age of dam; AN, animal direct additive genetic; M, maternal genetic effect; PE, maternal permanent; E: error or residual effect; r_AM, genetic correlation between direct additive genetic and maternal genetic.

Table 2 Descriptive statistics of the growth traits in Iranian Makuie sheep.

Trait	Sex	Birth type	No. of records	Mean, kg	SD	CV, %
BW	Male	Single	1992	4.52	0.54	11.91
		Twin	358	3.88	0.61	15.65
	Female	Single	2015	4.27	0.50	11.69
		Twin	373	3.59	0.51	14.08
Overall			4738	4.30	0.59	13.78
WW	Male	Single	1821	21.26	3.36	15.80
		Twin	346	17.10	5.36	31.34
	Female	Single	1955	19.70	2.94	14.95
		Twin	361	16.10	5.18	32.16
Overall			4483	19.84	3.91	19.68
6MW	Male	Single	1358	29.22	5.10	17.44
		Twin	228	25.48	4.55	17.86
	Female	Single	1673	26.46	4.03	15.22
		Twin	272	23.65	3.55	15.00
Overall			3531	27.24	4.79	17.59
9MW	Male	Single	1002	30.75	4.72	15.34
		Twin	143	27.49	5.04	18.34
	Female	Single	1411	27.40	3.96	14.46
		Twin	204	25.65	3.49	13.60
Overall			2760	28.49	4.63	16.24
YW	Male	Single	382	40.00	5.68	14.21
		Twin	45	37.62	5.88	15.62
	Female	Single	1327	31.30	4.16	13.30
		Twin	191	30.04	3.73	12.40
Overall			1945	33.03	5.76	17.45
ADG	Male	Single	1820	0.19	0.04	19.23
		Twin	346	0.14	0.04	24.93
	Female	Single	1955	0.17	0.03	18.20
		Twin	361	0.14	0.03	24.18
Overall			4482	0.17	0.04	21.47

BW, birth weight; WW, weaning weight; 6MW, 6-month weight; 9MW, 9-month weight; YW, yearling weight; ADG, average daily gain from birth to weaning; CV, coefficient of variation.

Table 3 Analysis of variance for birth weight, weaning weight, 6-month weight, 9-month weight, yearling weight and average daily gain from birth to weaning traits in Iranian Makuie sheep.

Fixed effects	BW	WW	6MW	9MW	YW	ADG
Year	^**	^***	^***	^***	^*	^***
Age of dam	^***	^*	^**	ns	^***	^***
Sex	^***	^***	^***	^***	^***	^***
Birth type	^***	^***	^***	^***	^***	^***
R^2	0.34	0.30	0.24	0.16	0.17	0.40

BW, birth weight; WW, weaning weight; 6MW, 6-month weight; 9WM, 9-month weight; YW, yearling weight; ADG, average daily gain from birth to weaning.

* Significant at 0.05 probability level;

** significant at 0.01 probability level;

*** significant at 0.001 probability level; ns, not significant at 0.05 probability level.

Table 4 Variance components and genetic parameters of different traits in Iranian Makuie sheep breed.

Trait	MF	h^2a	PE^2	h^2m	σAM	rAM	Log-likelihood
BW	I	0.36					1281.3028
	II	0.27	0.10				1304.1027
	III	0.20		0.16			1281.3028
	IV	0.20		0.10	0.04	0.26	1281.3028
	V	0.20	0.10	0.07			1304.1028
	VI	0.20	0.10	0.11	-0.005	-0.16	1304.1028
WW	I	0.41					-6733.6159
	II	0.20	0.17				-6673.8374
	III	0.20		0.20			-6733.6159
	IV	0.20		0.10	0.39	0.35	-6733.8619
	V	0.20	0.17	0.00			-6673.8375
	VI	0.20	0.17	0.11	-0.53	-0.42	-6673.8375
6MW	I	0.48					-6086.6756
	II	0.42	0.08				-6072.7768
	III	0.20		0.28			-6086.6756
	IV	0.20		0.25	0.22	0.08	-6086.6756
	V	0.20	0.08	0.22			-6072.7765
	VI	0.20	0.08	0.31	-0.81	-0.24	-6072.7766
9MW	I	0.42					-4669.9102
	II	0.37	0.05				-4666.9063
	III	0.20		0.22			-4669.9102
	IV	0.20		0.31	-0.76	-0.24	-4669.9102
	V	0.20	0.05	0.17			-4666.9063
	VI	0.20	0.05	0.10	0.49	0.30	-4666.9063
YW	I	0.36					-3636.6781
	II	0.31	0.06				-3634.4796
	III	0.20		0.15			-3636.6781
	IV	0.20		0.25	-0.97	-0.25	-3636.6781
	V	0.20	0.06	0.11			-3634.4796
	VI	0.20	0.05	0.29	-2.02	-0.45	-3634.4798
ADG	I	0.37					13509.2322
	II	0.17	0.17				13567.2569
	III	0.20		0.17			13509.2322
	IV	0.20		0.27	-6×10^-4	-0.26	13509.2322
	V	0.17	0.17	0.00			13567.2569
	VI	0.20	0.15	0.10	-7×10^-4	-0.51	13567.2566

h_2a, direct heritability; h^2m, maternal heritability; σ_AM, co-variance between direct additive and maternal additive genetic effects; r_AM, correlation between direct and maternal additive effects; PE², heritability due to permanent environment; MF, fitted model; BW, birth weight; WW, weaning weight; 6MW, 6-month weight; 9WM, 9-month weight; YW, yearling weight; ADG, average daily gain from birth to weaning.

Table 5 Correlation between traits in Iranian Makuie sheep breed from bivariate DFREML analysis (based on model II).

Trait 1	Trait 2	rp12	ra12	rpe12	re12
BW	WW	0.31	0.57	0.44	0.18
BW	6MW	0.25	0.49	0.41	0.08
BW	9MW	0.22	0.46	0.04	0.12
BW	YW	0.23	0.32	0.22	0.20
BW	ADG	0.15	0.33	0.31	0.02
WW	6MW	0.68	0.98	0.89	0.49
WW	9MW	0.63	0.93	0.87	0.45
WW	YW	0.50	0.84	0.57	0.30
WW	ADG	0.96	0.92	0.95	0.98
6MW	9MW	0.75	0.93	0.81	0.62
6MW	YW	0.59	0.80	0.76	0.43
9MW	YW	0.73	0.87	0.78	0.64

r_p12, phenotypic correlation between trait 1 and trait 2; r_a12, direct additive genetic correlation between trait 1 and trait 2; r_pe12, maternal permanent environmental correlation between trait 1 and trait 2; r_e12, residual correlation between trait 1 and trait 2; BW, birth weight; WW, weaning weight; 6MW, 6-month weight; 9WM, 9-month weight; YW, yearling weight; ADG, average daily gain from birth to weaning