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Timed Artificial Insemination Strategies with or Without Short-term Natural Service and Pregnancy Success in Beef Heifers by R. Kasimanickam; V. Kasimanickam; A. Kappes is a Medicine article available to read on EtoBox.

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Objective was to compare estrous response, and first service and breeding season pregnancy rates in Angus cross beef heifers that received four progesterone (CIDR, vaginal insert) -based estroussynchronization treatment regimens for timed artificial insemination (TAI) with or without short-term natural service (NS). Heifers (n 1⁄4 1744; 4 locations) were assigned a reproductive tract score (RTS: 1 1⁄4 immature, acyclic to 5 1⁄4 mature, cyclic), body condition score (BCS: 1 1⁄4 emaciated to 9 1⁄4 obese) and temperament score (0 1⁄4 calm to 1 1⁄4 excitable). Within location, heifers were assigned to either of four treatment regimens. patches in the morning of Day 0 and were subjected to NS (bull to heifer ratio, 1:25) from the morning of Day 2 (48 h from CIDR removal) to evening of Day 8. Heifers in CO-Synch þ C (COSC) þTAI þ NS treatment (n 1⁄4 433) received 100 mg GnRH þ CIDR on Day À7 and CIDR removal þ 25 mg PGF2a im þ estrus-detection patches in the morning of Day 0 þ 100 mg GnRH im þ TAI on Day 2, 60 h from CIDR removal, and were subjected to natural service (bull: heifer, 1:25) from the evening of Day 2 immediately after AI through Day 8. Heifers in COSC þ TAI treatment (n 1⁄4

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Author

R. Kasimanickam; V. Kasimanickam; A. Kappes

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Medicine (Health Sciences)