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Effect of Supplementation with Concentrates and Lasalocid during Late Pregnancy and Lactation on Productivity of Rambouillet Ewes and Development of Wool Follicles in Their Lambs^1,2,3,

New Mexico State University, Las Cruces 88003-0009

Abstract

A total of 64 Rambouillet ewes was utilized in this study. Ewes were fed a 50:50 mixture of alfalfa and prairie hay ad libitum and either no concentrates (C), .4 kg concentrates·head^–1 ·d^–1 (S) or .4 kg concentrates containing 73 ppm lasalocid·head^–1 ·d^–1 (SL) during the last 50 d of pregnancy and through 60 d of lactation. A total of 163 skin samples was obtained from the mid-side region of the lambs at birth, 1 and 2 mo of age, and follicle traits were estimated by histological techniques. Wool growth per unit area (100 cm²) was estimated by clipping wool from both right and left mid-sides of all ewes 60 d postpartum. Birth weight of single lambs did not differ (P>.20) among treatments. Twin lambs of supplemented ewes were heavier (P<.01) at birth than those of control ewes and the difference between S and SL groups was not significant. Compared with the control, concentrate supplementation with or without lasalocid increased (P<.01) postnatal lamb survival and ewe productivity, expressed as kilograms of lamb weaned per ewe lambed. The C, S and SL groups weaned 12.50, 18.52 and 20.72 kg/ewe lambed (P<.01), respectively. Maternal concentrate supplementation did not influence secondary to primary wool follicle ratio (Sf/Pf) of single lambs (P>.20). Twin lambs of the S ewes tended to have higher Sf/Pf than controls. The SL twins had intermediate Sf/Pf values (P>.20). Means of Sf/Pf for twin lambs of C, S and SL groups at 2 mo of age were 6.5 ± .8, 8.2 ± .4 and 7.4 ± .8, respectively. Supplementation with and without lasalocid had no effect on wool growth of ewes during late pregnancy and lactation.

¹ Journal article 1266 of the New Mexico Agr. Exp. Sta.

² Mention of a trade name or proprietary product does not guarantee or warranty the product and does not imply its approval to the exclusion of other suitable products.

³ Acknowledgement is given to Mrs. Paula Ross for her assistance in the preparation of this manuscript.

⁴ Dept. of Anim. and Range Sci.

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