Livestock
Permanent URI for this collectionhttp://hdl.handle.net/0/20
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Browsing Livestock by Subject "Age"
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Item Age-changes in the teeth of Zebu cattle(1953) Kikule, S. B.When life-history. records of herds of cattle are not being kept, It would be of some assistance to stock owners and others to be able to estimate the age of cattle from the development of their teeth. Such a method of estimation would be of great practical value for various reasons. Improvement of beef production by selective breeding would be possible if the farmer were able to select the early maturing type by observing the state of teeth development while the animal was growing.The sale for export of immature animals could be easily controlled as their ages could be gauged nearly enough for practical purposes by their teeth. Farmers wishing to purchase good foundation stock for breeding purposes would have a guide to the age.Item Effects of Age and Sex on Some Carcass Traits In The Indigenous Nigerian Pigs(1987) Fetuga, B. L.; Essien, A. I.Animal growth is characterized by two significant changes in the tissues, namely: increase in size and weight, and changes in the proportion and distribution of these tissues with respect to other carcass components. The commercial quality of a pig carcass is determined by the proportions of these tissues which in turn depend on: the age of the animal (McMeekan, 1940 and Barry et al., 1970) sex (Charette, 1961; Blair and English, 1965 and Knudson et a(., 1985), breed (Fetuga et al., 1976 and Evans and Kempster, 1979), nutrition (Hanson et al., 1975; Carden and Goenaga, 1979 and Davies et al., 1980).Item Genetic and Environmental Influence on Age at First Calving of the Kenya Sahiwal Cattle(2004) Muhuyi, W.B.; Carlesl, A.B.; Kenya Agricultural Research Institute, Naivasha, P.O. Box 25, Naivasha, KenyaData on age at first calving were obtained from 937 heifers born between 1967 and 1981 in the National Sahiwal Stud. The breeding pattern was such that births occurred in all months throughout the year, although not in equal proportions. Calves were separated from their dams immediately after birth, weighed and bucket-fed colostrum in the first week and whole milk thereafter at a rate of 10% of the body weight. Calves were weaned at 12 weeks at an average weight of 55 kg. After weaning, heifers were grazed on natural pastures consisting of star grass (Cynodon plectostachyum) and Kikuyu grass (Pennisetum clandestinum). There was a strong seasonal effect. Pastures were of good quality in the wet seasons (April-June and October-December), but deteriorated and were of low nutritive value in the dry seasons (January-March and July-September). Heifers were grazed in paddocks supplied with water. Mineral licks were provided ad libitum when available. Dipping was done weekly using acaricide solution to control ticks and vaccinations against foot and mouth, black quarter and anthrax diseases were undertaken yearly.Item Relationships Of Testicular Size, Body Measurements And Age In White Fulani (Bunaji) And N'dama Bulls(1991) Obasi U. O.; Nwakalor L. N.Previous studies have shown a strong positive relationship between testicular size, scrotal circumference (sq and sperm producing capacity of testes (Amann arul Almquilst, 1962; Hahn et aI., 1969 and Osinowo et al., 1977). Measurements of. scrotal circumference have been reported to have a correlation of 0.90 with paired testes weight (TW) (Coulter and Foote 1970) and to have high positive correlations with age and body weight (BW) of bulls (Coulter and Foote, 1977 and Sharma and Berg, 1982). This has resulted in recommendation that the SC, as an indicator of reproductive efficiency, should be emphasized• in selection programmes for young bulls (Hahn et al., 1969 and Lunstra et aI., 1978), The objective of the. Present study was to examine the relationships among measures of testicular s~, body size and age in white Fulani zebu and Ndama bulls and to determine the fullness. of scroll and body measurements age m predicting testicular size.
