The difficulties and costs of measuring individual feed intake in dairy cattle are the primary factors limiting the genetic study of feed intake and utilisation, and hence the potential of their subsequent industry-wide applications. However, indirect selection based on heritable, easily measurable, and genetically correlated traits, such as conformation traits, may be an alternative approach to improve feed efficiency. The aim of this study was to estimate genetic and phenotypic correlations among feed intake, production, and feed efficiency traits (particularly residual feed intake; RFI) with routinely recorded conformation traits. A total of 496 repeated records from 260 Holstein dairy cows in different lactations (260, 159 and 77 from first, second and third lactation, respectively) were considered in this study. Individual daily feed intake and monthly BW and body condition scores of these animals were recorded from 5 to 305 days in milk within each lactation from June 2007 to July 2013. Milk yield and composition data of all animals within each lactation were retrieved, and the first lactation conformation traits for primiparous animals were extracted from databases. Individual RFI over 301 days was estimated using linear regression of total 301 days actual energy intake on a total of 301 days estimated traits of metabolic BW, milk production energy requirement, and empty BW change. Pair-wise bivariate animal models were used to estimate genetic and phenotypic parameters among the studied traits. Estimated heritabilities of total intake and production traits ranged from 0.27±0.07 for lactation actual energy intake to 0.45±0.08 for average body condition score over 301 days of the lactation period. RFI showed a moderate heritability estimate (0.20±0.03) and non-significant phenotypic and genetic correlations with lactation 3.5 % fat-corrected milk and average BW over lactation. Among the conformation traits, dairy strength, stature, rear attachment width, chest width and pin width had significant (P<0.05) moderate to strong genetic correlations with RFI. Combinations of these conformation traits could be used as RFI indicators in the dairy genetic improvement programmes to increase the accuracy of the genetic evaluation of feed intake and utilisation included in the index.

The phenotypic correlations between selected body conformation traits and milk off-take of three indigenous cattle breeds were evaluated against a backdrop of widespread traditional practice of identifying better milking cows and heifers using these traits. It was conducted in Fogera, Dembia and Wogera districts of northern-western Ethiopia. One-shot exploratory field visits were used to randomly identify sample cattle herds. Data were collected on eight quantitative and six qualitative body conformation traits as well as milk off-take from 126 sample cows. Pearson's correlation coefficients were determined between these traits and milk off-take for large, medium and small categories of navel flap-size categories. Results show that the average daily milk off-take varies significantly between categories of udder size, size of milk vein and neck length mainly not only in Fogera but also in Dembia and Wogera cows. Statistically significant phenotypic correlations exist between all the quantitative conformation traits and milk off-take in the three breeds but the type and strength of these associations are variable, indicating breed specificity of these associations. The significant correlations between width and length of navel flap with milk off-take are consistent with traditional knowledge of farmers of using navel flap size as an indicator of better milk production in these indigenous cows. The negative correlations of milk off-take with dewlap width in both Fogera and Wogera cattle, especially under the large navel flap category, are in agreement with the indigenous knowledge of these communities about these associations. It was therefore concluded that these traditional subjective practices can be improved by introducing convenient ways of objectively measuring these traits and using them in more conclusive and predictable ways.

The Ongole cattle breed, also known as Nellore, is the native of the coastal districts Guntur, Prakasham and Nellore of Andhra Pradesh. This is a dual-purpose breed. Bullocks are very powerful and suitablefor ploughing and cart pulling. These animals are resistant to various insect-born diseases. The coat colour of Ongoles is glossy white but some maleshave grey markings on their hump and grey markings on the back quarters have also been noticed. The animals of this breed are heavy having long/large ears, dewlap, hump, limbs and barrel. The size of a tail, neck and horns is in general short. Ears are alert with a moderately short black tip. Horns are short and stumpy. The dewlap is large, fan shaped, fleshy and slightly pendulous. The udder is well formed with well-placed and developed teats. A survey was conducted in 60 villages in the breeding tract and 7 341 cattle true to the breed (Ongole) type were found. A genetic improvement/conservation programme for Ongoles is being executed by the Indian Council of Agricultural Research in collaboration with Acharya N G Ranga Agricultural University, Hyderabad (Andhra Pradesh). The progress of the programme was presented.