ChileanJAR

In the dry region between Talca and Ñuble the poor growth of the natural winter pasture causes a slow growth of early lambing (May-June), with a high mortality rate and late maturity.
In the Experimental Substation at Cauquenes, Merino Precoz Aleman and Suffolk sheep were divided into four groups; two groups were mated beginning January 1 (early mating) and two beginning February 15 (normal mating), mating lasted for eight weeks. The percentage and concentration of lambing, sex and birth of singles or twins of the lamb, and weights at lambing and weaning were recorded. In addition, the supplemental feeding was recorded.
The lambing of the normally mated groups was concentrated in the first 17 days of the lambing period. The weight of the lambs did not differ significantly between years or breeds; there was a clear interaction between sex and birth of singles or twins. The welghts at weanmg were different for matmg season and sex-single or twin's birth.
The Merino Precoz Aleman could be mated in either of the two mating seasons provided that supplemental feed was available. The Suffolk should be mated beginning February 20, since 12 to 15 more lambs per 100 ewes are produced.