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Effects of rumen-protected lysine fed to Holstein cows prepartum and the outcome on their calves.

B. L. Thomas



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Effects of rumen-protected lysine fed to Holstein cows prepartum and the outcome on their calves.
B. L. Thomas*1, A. R. Guadagnin1, L. K. Fehlberg1, Y. Sugimoto2, I. Shinzato2, F. C. Cardoso1. 1University of Illinois Urbana-Champaign, IL, 2Ajinomoto Co. Inc Tokyo, Japan.

This experiment was conducted to determine the effects on dairy calves when their dams were fed rumen-protected lysine (RPL; AjiPro-L Generation 3, Ajinomoto Heartland Inc., Chicago, IL; 0.54%DM of TMR as top dress) 28 d before calving. Seventy-two Holstein calves; (male, n = 37; and female, n = 35), blocked based on dams blocking criteria, were assigned into 2 different dietary treatments also based on dams prepartum treatment of RPL supplementation (L) or without (C). Birth weight was measured at 1 � 3h of birth, before colostrum administration. Calves were given 3.8L of colostrum replacer (Land O'Lakes Bovine IgG Colostrum Replacer, Land O'Lakes, Inc., Arden Hills, Minnesota, USA). All calves were placed in individual hutches (calf-tel, ample Corp., Germantown, WI). Calves were in the hutches for 56 d and are given water ad libitum. Calves were then given milk replacer (Advanced Excelerate, Milk Specialties, Carpentersville, IL; 28.5% CP, 15% fat) twice daily until 42 d of age. Grain starter (19.9% CP, 13.5% NDF, Ampli-Calf Starter, Purina, St. Louis, MO) was given from d 1 of age until d 56 at ad libitum. Calves BW, body length, heart girth, wither height, hip width, and hip heights were measured weekly, on weaning day (d 42), and end of trial (d 56). Statistical analysis was performed using the MIXED procedure of SAS. During wk 1 to 6 (wet period) male calves (47.01 kg) had greater (P < 0.0001) initial BW than females (41.49 kg). From wk 1 to 8, male calves had greater (P = 0.002) final BW than females (86.91 kg vs 78.96 kg, respectively). Male calves in the wet period (7.59 kg/kg; P < 0.0001), and wk 1 to 8 (7.00 kg/kg; P < 0.0001) had a greater gain: feed ratio than females (6.77 kg/kg and 6.3 kg/kg, respectively). Calves in C (0.08 cm/d) had higher (P = 0.03) ADG for heart girth; than calves in L (0.06 cm/d). Calves in L tended to consume more DMI (P = 0.06; 813.89 g/d) and CP (P = 0.07; 234.47 g/d) than those in C (792 g/d and 228.42 g/d, respectively). In conclusion, calves from dams fed RPL prepartum had improved overall growth and intake than calves from dams not receiving RPL.

Keywords: calf, lysine, average daily gain.