Wetteny Joseph
Executive Vice President and Chief Financial Officer at Zoetis
Thank you, Kristin. And good morning. As Kristin mentioned, we had a strong second quarter with balanced growth across both our companion animal and livestock portfolios as well as our US and International segments. In the second quarter, we generated revenue of $2.2 billion, growing 6% on a reported basis and 9% on an operational basis. Adjusted net income of $652 million, were 15% on a reported basis and 12% on an operational basis. Of the 9% operational revenue growth, 4% is from price and 5% is from volume. Volume growth consisted of 2% from other in line products, 2% from new products, including our monoclonal antibodies for osteoarthritis pain and 1% from our key dermatology portfolio.
Companion animal products are the primary driver of growth this quarter, growing 11% operationally with livestock growing 4% on an operational basis in the quarter. For companion animal, our key dermatology portfolio was the largest contributor to growth in the quarter, posting $355 million in revenue, our largest quarter ever and representing 14% growth on an operational basis. We saw double digit operational growth in both international and the US, driven by strong growth in Cytopoint as well as growth driven by Apoquel and the conversion to Apoquel Chewable in certain international markets. Our monoclonal bodies for osteoarthritis pain in dogs and cats, Librela and Solensia, posted $69 million in revenue globally in the quarter, with strong demand for both products, as well as the impact of the launch of Librela in several new international markets.
Our companion animal parasiticides also contributed to growth in the quarter, driven by our Revolution [Phonetic] franchise, which had $103 million in revenue and grew 22% operationally. Simparica Trio also contributed to the parasiticide growth with $248 million of revenue and growth of 5% operationally.
Our global companion animal diagnostics portfolio recorded $92 million in revenue in Q2, growing 12% operationally. We saw double digit growth in the US driven by high [Indecipherable] placements in the quarter and disruptions from the implementation of our new field force model that impacted the prior year. Sales of our livestock products grew 4% on an operational basis in the quarter. We saw growth across both our US and International segments driven by poultry, cattle and fish.
Now moving on to revenue growth by segment for the quarter. US revenue was $1.2 billion in the quarter, growing 7%, with companion animal products growing 7% and livestock sales growing 5%. As Kristin mentioned, our companion animal performance in the quarter reflects the stabilization of the distributor inventory levels that were a headwind to our growth in Q1. US vet visits were flat in the quarter [Indecipherable] revenue growth and average revenue per visit were both up 8%. These trends are in line with our expectations and continue to reflect the stabilization post COVID.
Turning to US product performance. Our key dermatology product sales were $241 million for the quarter, growing 10% and benefited from higher periodic patient visits in the quarter. Cytopoint sales continued to drive growth with vets and pet owners showing a preference for injectables. Our US small animal vaccines revenue grew 20% in the quarter, driven by higher sales of our canine influenza virus vaccine due in part to a competitor back order as well as higher sales into certain corporate and strategic accounts. Simparica Trio posted sales of $213 million in the quarter, growing 2%; growth was driven by in-patient demand across all channels partially offset by difficult comparison period given the timing of distributor shipments from last year doing enough supply challenges as well as aggressive competitive promotion in the current quarter. Our growth cadence for Trio across the year will be impacted by the timing of supply recovery in 2022 and we expect growth rate improvement in the second half. As expected, we received FDA approval for Librela in the US. We look forward to starting our early experience program in late Q3, with an expected November launch.
Now turning to US livestock. We saw 5% growth in our livestock portfolio in the quarter, primarily from our cattle business where we saw significant growth in Jackson [Phonetic], resulting from favorable comparative quarter last year, when an anticipated mid-year price reduction limited sales in the quarter. Additional US cattle growth came from Synovex, which benefited from our re-implementation label claim. Our US poultry portfolio also contributed to growth of 11%, based on our vaccine portfolio and an increased focus on egg layer market. We also benefited from favorable MFA rotation at certain large producers.
Moving on to our International segment, where revenue was $1 billion dollars, growing 6% on a reported basis and 11% operationally in the quarter. International companion animal revenue grew 17% operationally in the quarter while livestock revenue grew 4% operationally. Increased sales of companion animal products resulted from growth of our small animal parasiticides, our monoclonal antibodies for osteoarthritis pain, and our key dermatology products. Our International parasiticide portfolio growth was primarily driven by Revolution franchise with $57 million in revenue, growing 52% operationally, driven by the lack of supply last year, which particularly impacted China in the second quarter of 2022. Our Simparica franchise also contributed to growth with continued market share expansion, especially in Latin-America, Europe and Asia.
We continue to see strong adoption of Librela and Solensia. Librela generated $48 million in revenue, with 89% operational growth in the quarter driven by strong growth in Europe supported by our direct-to-consumer advertising efforts in major markets and with launches in various international markets including Canada, Australia, Brazil, and Japan. Solensia delivered $11 million in the second quarter sales internationally, driven by higher demand and supported by direct-to-consumer marketing efforts. Our international key dermatology portfolio grew 22% operationally. We continue to see double-digit operational growth across most of our major markets, driven by growth from and conversion to Apoquel Chewable as well as from Cytopoint with higher compliance and new patients. Our growth also benefited from a weak comparable quarter in Japan, which was impacted by pre-price buyouts in Q1 of last year.
Moving on to our International livestock portfolio, which were 4% on an operational basis in the quarter. Our poultry portfolio performed well, with growth driven by key account penetration and MFA rotations in core poultry markets including Europe, the Middle-East and Latin America. Our fish portfolio continues to perform well. As a result of increased sales of vaccines across salmon markets in Norway and Chile. Lastly, our cattle portfolio saw gains in Turkey, Brazil and Argentina from strong price growth and recovery of supply issues.
Now moving on to the rest of the P&L for the quarter. Adjusted gross margin of 72.4% improved 260 basis points on a reported basis compared to the prior year, resulting from favorable foreign exchange, price increases and favorable product mix. This was partially offset by higher manufacturing costs in the quarter. Adjusted operating expenses increased 8% operationally with both SG&A and R&D growing 8% operationally, driven primarily by headcount related compensation costs due to the timing of new hires in 2022 and the impact of annual salary increases. The lower growth in R&D expenses this quarter is reflective of the timing of spend in project investments and not a reduction in our expected R&D spend for the full year. Year-to-date, adjusted R&D expenses has grown 13% operationally.
The adjusted effective tax rate for the quarter was 21.5%, an increase of 80 basis points, driven by higher net discrete tax expenses in the quarter, mainly related to changes to prior year's tax positions and less favorable jurisdictional mix of earnings, partially offset by a higher benefit in the US related to foreign-derived intangible income. And finally, adjusted net income grew 12% operationally and adjusted diluted EPS grew 14% operationally in the quarter. Capital expenditures in the second quarter were $166 million and continue to be on track with our expectations for the year. In the quarter, we repurchased $324 million of Zoetis shares.
Now moving on to guidance for the full year 2023. Please note that guidance reflects foreign exchange rates as of late July. Beginning with revenue for the full year, due to unfavorable foreign exchange we are slightly lowering our revenue range while maintaining our guidance on operational revenue growth. We expect revenue between $8.50 billion and $8.65 billion, representing a range of 6% to 8% operational growth. With the approval of Librela in the US, we are now including our projected sales for November and December in our guidance, which are expected to be immaterial to our overall operational growth rate. Their impact on the full year revenue is largely offset by potential uncertainty in China as well as broader macroeconomic conditions in certain markets. Operationally, the first half has played out largely as we expected, with 6% operational revenue growth. We expect stronger growth in the second half of the year overall, especially in our US companion animal business. In livestock, which has grown 8% year-to-date on an operational basis. We anticipate unfavorable comparisons in the second half, driven by the timing of price decreases in Jackson [Phonetic] in the US last year, and the resumption of supply of several products after outages in the first half of 2022. We expect adjusted net income to be in the range of $2.50 billion to $2.55 billion, slightly above our previous guidance while maintaining our previous guidance of operational growth of 7% to 9%, driven by foreign exchange favorability in cost of sales and expenses, which were partially offset by unfavorability in revenue.
Reported diluted EPS increases to a range of $5.15 to $5.27, which is impacted by foreign exchange and a onetime gain from a business development deal. And finally, due to the impact of foreign exchange, we are increasing adjusted diluted EPS to be in the range of $5.37 to $5.47.
Just to summarize before we go to Q&A. We saw strong well based growth in the second quarter, growing in both companion animal and livestock as well as in the US and internationally, with contributions from price and volume. We expect stronger growth as we move into the second half. We remain confident in our ability to deliver on our operational full year guidance commitments. We continue to see improving fundamentals in the overall industry and remain committed to delivering on our value proposition to grow revenue faster than the market and to grow adjusted net income faster than revenue.
Now I'll hand things over to the operator to open the line for your questions. Operator?