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C. Landivar, C. S. Galina, A. Duchateau and P. Navarro-Fierro, “Fertility Trial in Zebu Cattle after a Natural or Controlled Oestrus with Prostaglandin F2 ? Comparing Natural Mating with Artificial Insemination,” Theriogenology, Vol. 23, No. 3, 1985, pp. 421-429. doi:10.1016/0093-691X(85)90014-7

has been cited by the following article:

• TITLE: Pharmacological Control of Estrus in Tropical Cattle, an Economical Assessment of Different Synchronization Protocols

  AUTHORS: Juan J. Molina, Iván Molina, Alejandro Jiménez, Carlos S. Galina, Juan J. Romero

  KEYWORDS: Tropics; Bos Indicus; Cost-Benefit; Estru; Synchronization

  JOURNAL NAME: Open Journal of Veterinary Medicine, Vol.2 No.3, September 28, 2012

  ABSTRACT: To compare the fertility results and to assess the cost-effectiveness of several synchronization protocols applied under the conditions of beef cattle enterprises in Colombia, 1658 multiparous zebu crossbred cows mostly Brahman and Nelore ranging between 2 - 6 parities were used. Five protocols of pharmacological treatments varying in hormones used, dosage and the time of application were tested. All cows were inseminated at 52 h by appointment. Pregnancy diagnosis was undertaken over 45 d after insemination by rectal palpation. The total cost per cow and the total cost per gestation, for each protocol, were calculated. Taking a herd of one-hundred cows as baseline for calculations, it was estimated the cost of the total amount of pregnancies possibly obtained in each protocol; then, the excess between the costs of a pregnant cow and the cost of a treated cow was estimated. Additionally, the costs due to cows empty after four services were calculated. A total of 874 pregnancies were registered (52.7%), with pregnancies per protocol varying between 46.9% and 66.2% (p