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espectivamente para el grupo en régimen de estabulación y el grupo en régimen de pastoreo. La
investigación queda abierta a una ulterior profundizacíón.
introduction
In the last few years sheep breeding has attracted more and more the attention of the researchers worldwide
(Búfano and Dario, 1992; Falaschini, 1996; Pulina and Brandano, 1996; Pulina and Rassu, 1991), who liad particularly
considered lamb Üian milk production. The milk yield and processing, typical of the Mediterranean Countries, are still
bound to the traditional breeding systems (Casu and Ledda, 1990; Rossi et al, 1991). This causes the Italian breeders
rising worries as tliey fear the comparison with otlier European productive realities (Cianci, 1991; Cosseddu, 1993; Dario
et al, 1996), in tenns of marketability (competition with cheaper producís because of higher productive levéis) and
wholesomeness (ability to comply with the qualitative and healthy standards required by the Community). Therefore over
Üie past few years most of the Italian sheep breeders have felt the need to renew tlieir breeding systems (Dattilo and
Congiu, 1974), also because of the increasing lack of manpower. The prevailing breeding systems are the traditional ones,
planned on natural grazing and using oíd technologies. It is logical to suppose that ¡n the next few years there will be a
noticeable renewal in such breeding systems with technical solutions suitable for intensive sheep breeding (Dattilo and
Congiu, 1974; Pulina, 1990; Rossi and Pulina, 1991). This should resoíve also (lie above mentioned lack of manpower.
MATERIAL AND METUODS. The main aim of this research was to get useful
indications about the suitability of the Leccese breed to be reared intensively in permanent
stabling under the environmental conditions of Southern Italy (Apulia).The trial was
carried out on 2 homogeneous (4-7 years oíd, all lambed in the same period) groups of
ewes: the former were reared according to the traditional breeding system of the farm
(grazing throughout the inorning and return to the sheep-house at sunset), the latter were
permanently stabled in a paddock provided with a sheep-pen and fed on a controlled diet.
Table 1 shows the chemical and nutritive characteristics of the diet supplied 3 times a day
(at 6.00 a.m.,after the first miiking, at 12.00 a.m and at 5.00 p.m., after the second
milking) and varying from 0.5 to 2.1 kg respectively during the dry and the miiking
period, together with straw ad libitum. Since day 31 after lambing the individual yields
and the chemical composition of the individual samples of milk (fat, protein, and lactose)
were recorded every 2 weeks for all the ewes. The collected data were stastically analyzed
using the following factorial model:
Yijk = M- + a¡ + Pj + (ap)ü + e¡jk
where:
Y¡j t = valué of the considered parameter;
¡i. = overall mean;
cc¡ = effect of the i, h control (1, 12);
Pj = effect of the j, h breeding system (1,2);
(ocP)¡j = effect of interaction;
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