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Effect of colostrum immunoglobulin concentration on immunity in Majorera goat kids

C. Rodríguez^*, N. Castro^*, J. Capote, A. Morales-delaNuez^*, I. Moreno-Indias^*, D. Sánchez-Macías^* and A. Argüello^*,1

^* Department of Animal Science, Las Palmas de Gran Canaria University, Arucas 35413, Spain
Canary Agronomic Science Institute, La Laguna, Tenerife 38200, Spain

¹ Corresponding author: aarguello{at}dpat.ulpgc.es

The aim of the research was to evaluate the effects of immunoglobulin G (IgG) colostrum concentration on goat kid immune status when the total amount of IgG fed was constant. Majorera goat kids (n = 56) were randomly assigned to 1 of 4 groups, and kids received 4 g of IgG per kg of body weight of atomized colostrum at 4 different IgG concentrations: 20 (AC-20), 40 (AC-40), 60 (AC-60), and 80 (AC-80) mg/mL. Blood samples were obtained on d 0, 1, 2, 3, 4, and 5 postpartum. Immunoglobulin G, IgA, and IgM plasma concentrations, apparent efficiency of absorption of IgG, plasma chitotriosidase activity, plasma complement activity, and plasma proteinogram were measured. Plasma IgG and IgM concentrations were highest on d 1 in AC-80 animals, and IgA plasma concentration was lower in AC-20 than in AC-80. The apparent efficiency of absorption was higher in AC-80 (24.4%) than in the other treatment groups (by an average of 13.8%). Chitotriosidase plasma activity on d 5 (1,488 nmol/mL per hour) was higher than on d 0 and 1 (average of 1,183 nmol/mL per hour). There were no effects of colostrum IgG concentration on complement activity and plasma protein distribution, but -globulin and -globulin were lower on d 0 than on d 1, 2, 3, 4, and 5. Increasing the immunoglobulin concentration in colostrum using atomized colostrum improves the immunoglobulin absorption at the same amount of immunoglobulin fed.

Key Words: goat kid • immunoglobulin G • chitotriosidase • complement system