Dans cette étude, les auteurs font le point sur les principaux résultats obtenus chez le zébu Gobra. La croissance est de 280 g/j dans les conditions d'élevage du C. R. Z de Dahra. Elle peut atteindre cependant 736 g chez des mâles recevant dès la naissance une alimentation équilibrée et 1 080 g dans des unités d'embouche. Les caractéristiques de carcasse sont bonnes et comparables à celles de la plupart des races à viande spécialisées. L'âge à la lère mise-bas (1 365,6±24 j) et l'intervalle entre mise-bas (15,5 mois) sont élevés mais sont susceptibles de diminuer lorsque les conditions d'élevage sont améliorées.

Individual increase in inbreeding coefficients (ΔFi) has been recommended as an alternate measure of inbreeding. It can account for the differences in pedigree knowledge of individual animals and avoids overestimation due to increased number of known generations. The effect of inbreeding (F) and equivalent inbreeding (EF) calculated from ΔFi, on growth traits were studied in Nilagiri and Sandyno flocks of sheep. The study was based on data maintained at the Sheep Breeding Research Station, Sandynallah. The pedigree information and equivalent number of generations were less in Sandyno compared with Nilagiri sheep. The average F and EF for the Nilagiri population were 2.17 and 2.44, respectively and the corresponding values for Sandyno sheep were 0.83 and 0.84, respectively. The trend of inbreeding over years in both the populations indicated that EF was higher during earlier generations when pedigree information was shallow. Among the significant effects of inbreeding, the depression in growth per 1 percent increase in inbreeding ranged from 0.04 kg in weaning weight to 0.10 kg in yearling weight. In general, more traits were affected by inbreeding in Nilagiri sheep, in which greater regression of growth traits was noticed with F compared with EF. Higher values of EF than F in earlier generations in both the populations indicate that EF avoided the potential overestimation of inbreeding coefficient during recent generations. In the Sandyno population, the magnitude of depression noticed among growth traits with significant effects of inbreeding was higher. The differences in response to F and EF noticed in the two populations and possible causes for the trait wise differences in response to F and EF are appropriately discussed.

A pilot survey was conducted in the western d.istrict of Sikkim to monitor the status of the Siri cattle breed. Data was recorded on certain morphological characters, management practices and performance of Siri animals. Measurements were recorded of body length, heart girth, body height, paunch girth, hip width, pin width, face length, face width, ear length and horns on 89 animals of age groups up to 1 year,1 to 3 years and adult. It was noted that pure Siri animals were reared only in the remote inaccessible areas. Extensive crossbreeding with Jersey semen/bulls is progressively eroding the purity of the breed. Measures to conserve the Siri cattle breed in its native ecology have been advocated.

The Kenana cattle breed originates from Bos indicus or humped cattle. The name Kenana came from the traditional owners, the Kenana people, who are mainly nomadic and semi-nomadic tribes. The light blue-gray coat is the characteristic color of Kenana cattle. Calves are frequently born with a brown-red coat that tends to change to a permanent gray at three to six months of age. At maturity the average body weights of males and females range from 300–500 kg and 250–350 kg respectively. The total population of Kenana and Butana cattle as major milk producers comprises 25% of the whole cattle population of Sudan. The Kenana homeland is the delta between the White Nile and the Blue Nile. The main system of production is the range system which includes the pastoral and semi-pastoral types. The nature of the nomadism in Kenana is relatively mild. The average milk production per lactation (198–257 days) varies between 1 400 kg and 2 100 kg respectively and maximum production is attained at seven to eight years of age.

Data on breeding management, breed and trait preference for pigs were collected from smallholder farmers in Kiambu and Kakamega Counties of Kenya. The production systems evaluated were semi-intensive and extensive and depicted varying pig production intensities, production objectives, pig performances as well as farmers’ breed and trait preferences. The perception of the importance of traits was evaluated to obtain a more balanced objective view on production and/or breeding objectives. The data collected were analysed through computation of indices, which represented a weighted average of all rankings of a particular trait. In the semi-intensive system, preference for performance traits such as size, growth rate and body weight, scored the same index (0.181), followed by the reproduction trait – prolificacy (0.161). In the extensive system, the indices for these traits were 0.187, 0.183, 0.163 and 0.106, respectively. Spearman's non-parametric rank correlations were calculated for ranking of traits of economic importance to indicate the directional effects and plausible trade-offs between traits. In the semi-intensive system, correlations were moderate between growth rate and both size and weight. In the extensive system, correlations were moderate for growth rate with both size and body weight. Appropriate breeds that suit the divergent production systems need to be identified and utilized based on performance and adaptability to ensure efficient resource use.

Goats make up the largest group of ruminant livestock in Nigeria and are strategic in bridging animal protein supply gap and improving the economy of rural households. The hypervariable region 1 (HVR1) of the caprine mitochondrial genome was investigated to better understand genetic diversity important for improving selection for animal breeding and conservation programs. We sequenced and analysed the mitochondrial DNA (mtDNA) HVR1 in 291 unrelated indigenous Nigerian goats (West African Dwarf (WAD), Red Sokoto (RSO) and Sahel (SAH)), randomly sampled from around the country, and compared them with the HVR1 sequences of 336 Indian goats and 12 other sequences in five different species in the genus Capra (C. falconeri, C. ibex nubiana, C. aegagrus, C. cylindricornis and C. sibirica). A total of 139 polymorphic sites from 291 individuals were captured in 204 haplotypes. Within and among population variations were 77.25 and 22.74 percent, respectively. Nigerian goats showed high genetic diversity (0.87) and high FST values, and separate from Indian goats and other wild species. Haplogroups in WAD separates it from RSO and SAH concomitant with a different demographic history. Clear genetic structure was found among Nigerian goat breeds with appreciable variation in mtDNA HVR1 region. This study grouped Nigerian goat breeds into two major groups suggesting two different demographic origins for Northern and Southern breeds. High genetic admixing denotes different maternal origins and in contrast to evidence from goats from Levant and Central Asia, where goats were originally domesticated.

Indigenous cattle breeds represent a unique genetic resource, and understanding their variability, population structure and breeding units is important for their sustainable conservation. The endangered Jutland breed was widespread in Denmark in the eighteenth century, but decreased in population size following the introduction of modern farming. We investigated the impact of recent anthropogenic fragmentation of the breed by analysing 737-bp mitochondrial DNA and 23 microsatellites in 207 individuals. The results revealed the Jutland breed as a unique genetic entity with high levels of genetic diversity, and only limited introgression from other black-pied breeds. The data reflected the impacts of fragmentation and restricted gene flow in breeds with small segregated herds, and revealed the rapid differentiation of herds resulting from genetic drift. The application of a management strategy that conserves diversity and minimizes increase in inbreeding is important for the future conservation of the Jutland breed and other indigenous cattle breeds.

The switch from keeping laying hens in a floor or free range system into a cage system led to a considerable change in the way that breeding and selection took place. In the past 40–50 years up to the present date, the increase in genetic improvement of the egg laying trait was substantial. However, cage-adapted populations of laying hens seem to have lost some of their abilities to an adequate performance when returned to the old floor\free range systems. The strong concentration of all parts of the poultry production has meant that less than 10 international breeding companies supply most hens for laying purposes in the world and they have very little interest in developing genetic material for the West-European region where there are marked consumer preferences for eggs produced in non-cage systems. A particular Danish line, of White Leghorn origin named “The Skalborg hen” seems to have survived during an era of cage production system and they seems to have a production potential at farm level.

We have worked with the endangered Andalusian minor breeds. The priorities for the conservation of these breeds have been thoroughly studied. The following factors: antiquity and history of the breed, the number of existing strains or ecotypes, lhe actual number, their ecological and sociological interest, the present genetic status, and their productive importance, have been taken into account in the priority evaluation.

We are presenting the results obtained using our own polarographic method for the evaluation of priorities (priority index). With these data we establish three categories between the studied Andalusian breeds, and at thesame time we propose the most suitable measures for the conservation of each of these categories.

Navajo-Churro sheep have been part of the subsistence of three cultures in the Southwest of the United States for over 400 years. These cultures include Navajo (a Native American nation), Hispanic and Anglo. The Navajo-Churro breed nearly became extinct in the 1950s to 1970s, but farsighted conservation programmes were then begun which involved all three cultures in saving this unique breed. Navajo-Churro sheep are a distinctive double-coated Criollo breed. The fleece type is superbly suited to the textiles produced in the local region and which are famous throughout the United States for their unique qualities and cultural relevance. A registry system involving ongoing inspection of each generation assures that the type remains traditional. Census numbers are now close to 3000 head as the breed moves beyond its original homeland to become more widely established throughout the United States.

Sheep are reared across a wide range of agro-ecosystems in Bhutan. A sample survey was conducted to characterise indigenous sheep breeds and husbandry practices. Information was recorded on morphological characteristics, body measurements and management variables. Based on geographical locations, four distinct native sheep types are described: Jakar, Sipsu, Sakten and Sarpang. This paper also describes the socio-economic importance of sheep, its trends and future prospects of sheep farming in Bhutan.

A unique strain of sheep, known to lead the flock, has evolvedwithin the short-tailed, native breed of Iceland sheep. Leadersheep, known for centuries, walk or run in front of the flock, even in bad weather conditions, they may foresee climatic events and are generally very alert and attentive. The high level of intelligence expressed by these sheep is known to be strongly inherited, without being linked to sex, age, colour and otherexternal traits. However, little is known about the genetics of leadersheepper se. Most of them are non-white and horned with a slender body conformation. Since they are endangered with a breeding population of only some 1 000 purebred animals, mostly ewes, conservation measures are in progress, mainly through AI and individual recording. To strengthen these effortsenthusiastic breeders and scientists founded the Leadersheep Society of Iceland in the spring of 2000. While the main aim is to conserve and maintain leadersheep, future possibilities of utilizing their unique characteristicsare being considered.

The Iraqi indigenous chickens (I.I.C.) are well adapted to a wide range of ambient temperature (-5°C to 50°C). They are found throughout the country and are raised for meat and eggs. The birds are active and independent foragers.

The IPA Agricultural Research Centre played a role in the purification and multiplication of five different genetic lines according to feather colour. These lines are the progeny of segregating populations of the foundation stock which was a specimen collected from all over the country. The plumage colour of the I.I.C. lines varied from white to black. Most of the birds have white skin colour; comb type is single; egg-shell colour varied between white, tinted to brown; age at sexual maturity ranged between 162 to 166 days; body weight at sexual maturity was found to be similar for the differentlines (1.4 kg) indicating that I.I.C are small-sized birds and variations among lines of the I.I.C were significant for egg production, egg weight and feed efficiency.

The origin of the Criollo cattle of the Americas is described. Then a review is given of the Criollo in each of a number of different Latin American countries with their present known performances, their geographical distributions, numbers and improvement programmes.

Vechur cattle, once popular in southern Kerala (India) is on the verge of extinction. By extensive search the few remaining animals could be traced. They are being conserved by Kerala Agricultural University. Cows are extremely sma.ll in size, i.e. weighing around 125 kg with a height of not more than 90 cm They are capable of producing 2–3 kg fat milk per day. Heat tolerance, disease resistance and general adaptability are added qualities. Age at first calving is three years and the intercalving period 14 months. As a part of characterization of these animals, cytogenetic, biochemical, immunogenetic studies as well as blood typing, milk composition and fat globule studies have been taken up.

Genetic diversity and Zebu genetic introgression have been assessed in five subpopulations of cattle along the coastal region of Togo, Benin and Nigeria using 15 autosomal and one Y- specific microsatellite markers. Mean observed heterozygosity (Ho) ranges from 0.55 to 0.61 and the mean number of alleles (MNA) from 5.47 to 6.47. Genetic differentiation indexes (Fst), were significant between the five subpopulations (P< 0.01). Some possible population diagnostic alleles are identified with allele 254 at locus ILSTS033 and allele 182 at locus ILSTS005 found only in the population from Togo with frequencies of 5.41% and 12.82% respectively. Allele 226 of locus ILSTS103 is fixed in the Togolese population (100%) and almost fixed (98.75%) in the Benin-Valley population. Y chromosome analysis reveals male Zebu introgression in all five populations with a frequency of indicine Y chromosome ranging from 37.5% in Benin-Valley and Benin Plateau East to 100% for Benin Plateau West. Admixture analysis using the programme STRUCTURE (k = 2) confirms phenotypic observations suggesting different level of taurine background and therefore Zebu introgression amongst the populations. Within populations, variations in levels of Zebu admixture between herds were also detected. Whereas the valley population from Benin shows low level of Zebu introgression, it is the population from Benin Plateau East which is the purest.

Western Visayas has largest population of native chickens in the Philippines; however, data on the phenotypic and genetic diversity is limited. Eight hundred and ten chickens from 270 different flocks, from six provinces within the region were chosen for characterization. Data collected includes farmer selection practices, means of identifying genetic groups and information on phenotypic traits of native chickens. This information was analysed using statistical tools suggested by FAO. Phenotypic diversity and equitability of distribution were analysed using Simpson's diversity index and equality of distribution. Results showed that native chicken genetic resources are comprised of two types, the Jolo and Bisaya; the latter was further divided into Bisaya–Cluster I and Bisaya–Cluster II. Jolo chickens were the heaviest (P < 0.01) but comparable with Bisaya–Cluster II in terms of egg weight, head shape and phenotypic distance. They all had higher diversity and equitability of distribution in their plumage colour and pattern, though the iris and shank colour had higher diversity but had limited distributions. Bisaya–Cluster II and Jolo chickens had higher diversity and above average distribution in liveweight. They were also homogenous in feather morphology and distribution; head and breast shape, and skeletal variants. Thus, the observed diversities and distributions can be used in identifying genetic materials for any breeding undertakings.

In order to satisfy the demands of the modern consumer for food of high quality, low in fat but rich in polyunsaturated fatty acids, farmers from the inner regions of both Italy and Greece in recent years have started to orient their activity to the rearing of autochthonous animal populations, as in the case of the bovine Podolian (Italy) and Katerini (Greece). As both of these populations (raised in two different countries, but under a similar free-range production system) were derived from Bos primigenius, it was considered interesting to compare their meat characteristics. For this target, eight animals were used, subdivided into two groups: Podolian group (reared in Italy and slaughtered at 18 months of age) and Katerini group (reared in Greece and slaughtered at 18 months of age). All animals were fed only on local pasture and they were slaughtered in licensed slaughterhouses in their country of birth and they were analysed in the laboratories of the University of Bari in Italy. The results show that the raw meat of Katerini bulls is less red, has higher moisture and is leaner. The fat of this meat is richer in C18:0 and ω3 fatty acids. These data seem to indicate that the meat produced by the breeds studied can satisfy the dietary demands of the modern consumer. As the Katerini breed is threatened with extinction, this study can offer a reason to the local authorities to make a possible future rescue programme, which necessarily passes through a chemical and nutritional characterization of its meat.

L'article présente une révision intéressante de l'état actuel des ressources génétiques animales en Cóte d'Ivoire. Les cinq espéces principales (bovins, ovins, caprins, porcins et volailles) sont présentées. I1 existe trois groupe de bovins autochtones: le Baoulé, le N'Dama et le Lagune; les deux derniers sont considérés trypanotolérants. Le Baoulé posséde une population de presque 500 000 animaux et le N'Dama quelques 100 000, tandis que la population de Lagune de petite taille est de moins de 1000. I1 existe également u.ne population transhumante formée de zébus croisés (Baoulé x zébu) ainsi que de N'Dama croisés avec des German Fleckvieh ou des French Abondance. La race d'ovin plus répandue est la fameuse Djallonké (environ 1200 000 animaux) que l'on rencontre aussi bien dans les foréts que dans les savannes. L'Institut des Sciences a initié un programme de sélection en 1980 qui se poursuit actuellement. Dans le cas des chévres la seule race présente est la naine de l'Afrique de l'ouest, appelée aussi Djallonké, avec une population de un peu moins de 1 000 000. Les secteurs porcins et de volailles sont dominés par la présence de races locales et de quelques croisements avec des races importées. L'article présente une description approfondie des systémes de production traditionnels et de leur évolution; il donne également des indications sur les normes de conservations existantes pour les races N'Dama, Baoulé et Djallonké.