Genetic parameter estimation of semen characteristics and sire selection traits for Bonga sheep under the community-based breeding program

Figures & data

Table 1. Data structure for identified breeding sires of Bonga sheep under CBBP

Items	Values
No. of animal IDs in total	233
No. of animals after pruning	118
No. of levels w/out records	17
No. of levels with records	101
No. of animals w/out offspring	85
No. of animals with offspring	33
No. of animals with unknown sire	46
No. of animals with unknown dam	112
No. of animals with both parents unknown	45
No. of animals with records and unknown sire	29
No. of animals with records and unknown dam	95
No. of animals with records and both parents unknown	28
No. of sires	30
No. of dams	39

Where: CBBP = community based breeding program; No. = number.

Table 2. Best-fit model selection for the data set of breeding sires of Bonga sheep under CBBP

Items	Model 1	Model 2	Model 3	Model 4	Model 5	Model 6
Max Log L	−263.702	−296.801	−259.424	−1307.129	−259.104	−1191.041
parameters	42	63	63	99	83	120
AIC	611.404	719.602	644.848	2812.258	684.208	2622.082

where CBBP = community based breeding program; Max Log L = maximum log likelihood; and AIC = Akaike information Criteria.

Table 3. Multivariate analyses of variance components and heritability estimate for semen characteristics traits of Bonga sheep

Studied traits	Model	σ^2a	σ^2 m	σ^2e	σ^2c	σ^2p	σam	h^2a	h^2m	c^2	ram
Semen volume	1	0.03	-	0.11	-	0.15	-	0.23  ± 0.122	-	-	-
	2	0.02	-	0.05	0.05	0.13	-	0.19  ±  0.111	-	0.42	-
	3	0.02	0.06	0.04	-	0.13	-	0.15  ±  0.03	0.50  ±  0.200	-	-
	4	0.10	0.12	0.10	-	0.42	0.10	0.23  ±  0.102	0.29  ±  0.111	-	0.88
	5	0.09	0.07	0.01	0.01	0.12	-	0.07  ±  0.101	0.63  ±  0.313	0.13	-
	6	0.10	0.12	0.10	0.10	0.52	0.10	0.18  ±  0.08	0.24  ±  0.089	0.18	0.88
Sperm mass motility	1	0.06	-	0.39	-	0.44	-	0.13  ± 0.129	-	-	-
	2	0.11	-	0.22	0.12	0.46	-	0.24  ±  0.190	-	0.26	-
	3	0.09	0.13	0.23	-	0.46	-	0.20  ±  0.188	0.28  ±  0.192	-	-
	4	0.45	0.45	0.45	-	1.45	0.10	0.31  ±  0.100	0.31  ±  0.100	-	0.22
	5	0.04	0.08	0.28	0.02	0.44	-	0.10  ±  0.012	0.19  ±  0.021	0.06	-
	6	0.45	0.45	0.45	0.45	1.90	0.10	0.23  ±  0.132	0.23  ±  0.114	0.23	0.22
Sperm concentration	1	0.11	-	0.75	-	0.87	-	0.13  ± 0.110	-	-	-
	2	0.25	-	0.40	0.22	0.89	-	0.28  ±  0.190	-	0.25	-
	3	0.23	0.19	0.45	-	0.89	-	0.26  ±  0.201	0.22  ±  0.105	-	-
	4	0.85	0.85	0.85	-	2.65	0.10	0.32  ±  0.280	0.31  ±  0.202	-	0.11
	5	0.09	0.07	0.55	0.12	0.85	-	0.11  ±  0.210	0.08  ±  0.103	0.15	-
	6	0.85	0.85	0.85	0.85	3.50	0.10	0.24  ±  0.199	0.24  ±  0.132	0.24	0.11
Total spermatozoa	1	0.39	-	3.60	-	3.99	-	0.09  ± 0.036	-	-	-
	2	0.67	-	1.69	1.43	3.79	-	0.17  ±  0.110	-	0.37	-
	3	0.43	1.60	1.62	-	3.66	-	0.11  ±  0.090	0.43  ±  0.215	-	-
	4	2.00	2.00	2.00	-	6.10	0.10	0.32  ±  0.255	0.32  ±  0.210	-	0.05
	5	0.08	1.93	1.04	0.42	3.49	-	0.02  ±  0.112	0.55  ±  0.161	0.12	-
	6	2.00	2.00	2.00	2.00	8.10	0.10	0.24  ±  0.200	0.24  ±  0.109	0.24	0.05
Six-month body weight	1	3.28	-	5.55	-	8.84	-	0.37  ± 0.155	-	-	-
	2	2.46	-	5.02	1.60	9.10	-	0.27  ±  0.105	-	0.17	-
	3	2.33	1.64	4.80	-	8.78	-	0.26  ±  0.093	0.18  ±  0.102	-	-
	4	0.30	0.30	0.30	-	1.00	0.10	0.30  ±  0.120	0.30  ±  0.211	-	0.33
	5	3.29	3.39	1.85	0.69	9.24	-	0.35  ±  0.212	0.36  ±  0.231	0.07	-
	6	0.30	0.30	0.30	0.30	1.30	0.10	0.23  ±  0.062	0.23  ±  0.130	0.23	0.33
Scrotum circumference	1	0.52	-	4.22	-	4.74	-	0.11 ± 0.162	-	-	-
	2	1.12	-	1.80	1.88	4.82	-	0.23  ±  0.240	-	0.39	-
	3	0.88	2.22	1.62	-	4.73	-	0.18  ±  0.119	0.47  ±  0.295	-	-
	4	0.20	0.20	0.20	-	0.70	0.10	0.28  ±  0.090	0.28 ± 0.141	-	0.50
	5	0.27	1.44	1.68	1.33	4.73	-	0.05  ±  0.142	0.30  ±  0.204	0.28	-
	6	0.20	0.20	0.20	0.20	0.90	0.10	0.22  ±  0.071	0.22  ±  0.199	0.22	0.50

Where: σ²_a, σ² _m, σ²_e, σ²_c, σ²_p: variance of direct, maternal, residual, maternal permanent environment, and phenotypic respectively; σ_am covariance between direct and maternal; h²_a, h²_m, c² heritability of direct, maternal, and ratio of maternal permanent environmental variance to phenotypic variance; and r_am: genetic correlation between direct and maternal.

Table 4. Genetic below diagonal and phenotypic above diagonal correlations among semen characteristics for Bonga sheep

Traits	Volume	Motility	Concentration	TSP	SMWT	SC
Volume		0.39 ± 0.096	0.29 ± 0.102	.90±.021	0.19 ± 0.109	0.43 ± 0.091
Mass motility	−0.19 ± 0.002		0.36 ± 0.095	.46±.088	0.19 ± 0.108	0.45 ± 0.089
Concentration	−0.77 ± 0.300	−0.34 ± 0.102		.64±.65	0.18 ± 0.107	0.22 ± 0.105
TSP	0.66 ± 0.213	−0.42 ± 0.411	−0.19 ± 0.018		0.25 ± 0.105	0.45 ± 0.088
SMWT	−0.87 ± 0.318	0.58 ± 0.301	0.45 ± 0.206	−.83±.510		0.26 ± 104
SC	−0.80 ± 0.492	0.54 ± 0.299	0.55 ± 0.144	−.41±.271	0.83 ± 0.598

where SMWT = six months body weight; TSP = total spermatozoa; and SC = scrotum circumference.