In the northwestern of Argentina it is very common to detect goats with iodine deficiency disorders. Information about the effects of iodine supplementation on milk yield in dairy goats is rather scarce. Therefore, the aim of this work was to evaluate the effects of the supplementation with 2 different iodine sources on dairy goat’s productive performance. Twenty multiparous Saanen dairy goats were randomly assigned to 2 treatments: potassium iodide (PI) and organic iodine long acting (OI). Doses were suggested by the manufacturer: PI: 3 mg/goat and OI: 200 mg/goat. In both treatments, iodine was administered subcutaneously 45 d prepartum. For the PI group, additional dose was administered 45 d postpartum. During the entire trial period each group was fed alfalfa hay ad libitum and 0.5 kg corn/d per goat. Data were collected at 15, 30, 60 and 90 d postpartum. Milk yield was determinate by Waikato lactometers and milk samples for composition were collected during milking and analyzed by Milko-Scan FT 600. Data were analyzed with linear mixed model according to a repeated measures design by Infostat program. Milk yield and milk composition are reported in Table 1. Iodine source did not affect any of the studied parameters, except milk fat content that increased in OI goats. Based on the data obtained in the present trial and the fact that all parameters evaluated were within the standard values suggested for goat milk, it is possible to conclude that there are no differences between both iodine sources in dairy goats. Table 1 (Abstr. T191). Milk yield and milk composition from goats supplemented with potassium iodide (PI) or organic iodine (OI)

Item	Treatment		SE	P <
PI	OI	Iodine source	Sampling day	Interaction
Milk yield, L/d	2.59	2.24	0.20	NS	0.001	0.001
Fat, %	3.55	4.08	0.13	0.008	0.001	NS
Protein, %	3.04	3.09	0.05	NS	0.001	NS
Lactose, %	4.90	4.84	0.07	NS	0.001	NS
Solids-not-fat, %	8.76	8.76	0.10	NS	0.001	NS
pH	6.83	6.82	0.02	NS	0.001	NS
Acidity, °D	12.04	11.66	0.48	NS	0.001	NS