Seasonal changes and hypobiosis in Haemonchus contortus infection in the West African Dwarf sheep and goats in the Nigerian derived savanna

1990 ◽  
Vol 36 (1-2) ◽  
pp. 123-130 ◽  
Author(s):  
B.B. Fakae
1991 ◽  
Vol 53 (1) ◽  
pp. 61-69 ◽  
Author(s):  
S. J. G. Hall

ABSTRACTOne hundred and thirty-six multiparous cows, 63 goats and 71 sheep were measured in breeding flocks and herds in Nigeria. The humped cattle breeds, and the large-bodied, humpless Kuri, are narrow-bodied and tall in relation to their length when compared with British breeds. Pelvic dimensions are small. The sheep and goats native to the coastal and middle belts (the West African Dwarf breeds) are miniature versions of those found in the north. Neither appears to be achondroplasic but dwarfing seems to have proceeded differently in the two species in that the adult West African Dwarf goat is similar in its relative body proportions to the adult northern goat, implying a proportional miniaturization. The West African Dwarf sheep appears to be a neotenous form with body proportions similar to those of an immature sheep.


1981 ◽  
Vol 33 (3) ◽  
pp. 249-252 ◽  
Author(s):  
L. O. Ngere ◽  
G. Aboagye

ABSTRACTA study was made of some aspects of reproduction in the Nungua Black Head and the Ghanian variety of the West African Dwarf sheep. The gestation period of the two breeds was similar: 150 and 148 days respectively. Ewes mated in August and September tended to have slightly longer gestation periods than those mated in March. The mean birth weights were 2·2 kg in the Nungua Black Head and 13 kg in the West African Dwarf. Type of birth affected the weight of lambs at birth. The Nungua Black Head had no triplets, 0·132 twins and 0·868 singles. The West African Dwarf was more prolific: 0·402 singles, 0·557 twins and 0·041 triplets. The weight advantage of the Nungua Black Head lambs at birth was maintained to weaning and they also had better survival rates. The adjusted 12-week weaning weights averaged 9·8 and 5·8 kg respectively for the Nungua Black Head and West African Dwarf. What the West African Dwarf lost in individual weight it appeared to make up in numbers so that, when the breeds were compared in terms of kg of lamb weaned per ewe mated, there was no significant difference between them.


2021 ◽  
Vol 10 ◽  
pp. 55-59
Author(s):  
L. O. Ngere ◽  
K. E. Akinuli ◽  
I .O. Adeleye

Observations on the age at first breeding of West African Dwarf Sheep at the University of Ibadan. Nigeria showed that the optimal age and weight at 1st breeding of young ewes was not less than eleven months and at least 13kg respectively When mated earlier, the incidence of abortion in­creased and lambs tended to the smaller at birth. In ewes mated at older ages the lengthening of the generation internal was unacceptable. The relalionuship between weight (4 ) and age (X) from four to 56 weeks was estitnated as: Y (kg)      = 3.12 + 9.62 x — 0.02 x 2 + 0.0002 x 3 for singles. or    Y  =2.59 + 0.46 x = 0.01 x2 + 0.0001 x 3 for Mins.


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