Effects	N	Lambing interval	N	Litter size	N	Annual reproductive rate	N	Mortality rate
Overall	187	293 ± 2.29	167	1.04 ± 0.01	167	1.29 ± 0.02	167	6.31 `±` 0.01
CV (%)	187	5.71	167	14.74	167	13.65	167	25.10
Breed		^**		Ns		Ns		Ns
Crosses	12	306 ± 4.62^a	9	1.17 ± 0.00	9	1.37 ± 0.01	9	6.59 `±` 0.02
Local	175	287 ± 2.38^b	158	1.18 ± 0.02	158	1.49 ± 0.02	158	4.55 `±` 0.03
Birth season		^****		Ns		^****		^*
Dry	133	312 ± 2.84^a	120	1.15 ± 0.02	120	1.33 ± 0.02^b	120	7.58 `±` 0.02^a
Wet	54	281 ± 2.01^b	47	1.20 ± 0.03	47	1.52 ± 0.03^a	47	3.85 `±` 0.02^b
Parity		^****		Ns		^****		^**
1	66	330 ± 3.77^a	59	1.17 ± 0.02	59	1.30 ± 0.03^b	59	9.48 `±` 0.03^a
2	62	282 ± 1.47^b	59	1.20 ± 0.03	59	1.51 ± 0.04^a	59	4.55 `±` 0.03^b
3	59	277 ± 1.68^b	49	1.15 ± 0.00	49	1.47 ± 0.01^a	49	3.28 `±` 0.02^b
Lamb sex		Ns		Ns		Ns		Ns
Female	92	295 ± 3.45	81	1.01 ± 0.01	81	1.25 ± 0.02	81	7.53 `±` 0.02
Male	95	291 ± 3.05	86	1.06 ± 0.02	86	1.33 ± 0.03	86	5.13 `±` 0.02
Birth type		Ns						^**
Single	169	292 ± 5.05					138	5.45 `±` 0.01^b
Multiple	18	304 ± 2.47					29	11.11 `±` 0.05^a