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Studies on the sexual behaviour of the female purebred Holstein-Friesian in Egypt. II. Estrus cycle length and duration of estrus

, : Studies on the sexual behaviour of the female purebred Holstein-Friesian in Egypt. II. Estrus cycle length and duration of estrus. Alexandria Journal of Agricultural Research 21(2): 179-184

Oestrous cycle length in groups of 134 and 255 cows and 78 heifers averaged 33.5 days; of 494, 1523 and 312 cycles recorded in the 3 groups, 51.21, 52.20 and 33.22% resp. were in the range 18-25 days. For cycles in this range, av. cycle length was 21.12, 21.01 and 19.72 days resp., that of heifers being significantly shorter than that of cows. Season and parity had no effect on cycle length.


Other references

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Trimble, L.; Shankar, G.; Kelley, H.; Minderhout, V.; Bosch, M.L., 2002: Maturation of dendritic cells for cancer immunotherapy, using inactivated BCG and interferon gamma Induction of a vigorous Th1 response. Proceedings of the American Association for Cancer Research Annual Meeting 43: 680, March

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Kopylov, U.; Yung, D.E.; Engel, T.; Vijayan, S.; Har-Noy, O.; Katz, L.; Oliva, S.; Avni, T.; Battat, R.; Eliakim, R.; Ben-Horin, S.; Koulaouzidis, A., 2017: Diagnostic yield of capsule endoscopy versus magnetic resonance enterography and small bowel contrast ultrasound in the evaluation of small bowel Crohn's disease: Systematic review and meta-analysis. Capsule endoscopy (CE), magnetic resonance enterography (MRE) and small bowel (SB) intestinal contrast ultrasound (SICUS) are the modalities of choice for SB evaluation. This study aimed to compare the diagnostic yield (DY) of CE to MRE and SICUS...

Becklund, K.; Powers, J.; Kinkel, L., 2016: Tree species effects on pathogen-suppressive capacities of soil bacteria across two tropical dry forests in Costa Rica. Antibiotic-producing bacteria in the genus Streptomyces can inhibit soil-borne plant pathogens, and have the potential to mediate the impacts of disease on plant communities. Little is known about how antibiotic production varies among soil commun...

Esapa, C.T.; Hough, T.A.; Testori, S.; Head, R.A.; Crane, E.A.; Chan, C.P.S.; Evans, H.; Bassett, J.H.Duncan.; Tylzanowski, P.; McNally, E.G.; Carr, A.J.; Boyde, A.; Howell, P.G.T.; Clark, A.; Williams, G.R.; Brown, M.A.; Croucher, P.I.; Nesbit, M.Andrew.; Brown, S.D.M.; Cox, R.D.; Cheeseman, M.T.; Thakker, R.V., 2012: A mouse model for spondyloepiphyseal dysplasia congenita with secondary osteoarthritis due to a Col2a1 mutation. Progeny of mice treated with the mutagen N-ethyl-N-nitrosourea (ENU) revealed a mouse, designated Longpockets (Lpk), with short humeri, abnormal vertebrae, and disorganized growth plates, features consistent with spondyloepiphyseal dysplasia conge...

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